# MCQs For NCERT Class 10 Science Chapter 10 Light Reflection and Refraction

Please refer to the MCQ Questions for Class 10 Science Chapter 10 Light Reflection and Refraction with Answers. The following Light Reflection and Refraction Class 10 Science MCQ Questions have been designed based on the current academic year syllabus and examination guidelines for Class 10. Our faculty has designed MCQ Questions for Class 10 Science with Answers for all chapters as per your NCERT Class 10 Science book.

## Light Reflection and Refraction Class 10 MCQ Questions with Answers

Please see below Light Reflection and Refraction Class 10 Science MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question: The unit of power of lens is
(a) Metre
(b) Centimetre
(c) Dioptre
(d) M–1

C

Question: The radius of curvature of a mirror is 20cm the focal length is
(a) 20 cm
(b) 10 cm
(c) 40 cm
(d) 5 cm

B

Question: An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be
(a) 0.25 m
(b) 1.0 m
(c) 0.5 m
(d) 0.125 m

C

Question: Convex lens forms a real, point sized image at focus, the object is placed
(a) At focus
(b) Between F and 2F
(c) At infinity
(d) At 2F

C

Question: The angle of incidence for a ray of light having zero reflection angle is
(a) 0°
(b) 30°
(c) 45°
(d) 90°

A

Question: Which of the following mirror is used by a dentist to examine a small cavity?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Combination of convex and concave mirror

C

Question: An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get
(a) shortened and real
(b) enlarged and real
(c) enlarged and virtual
(d) diminished and virtual

D

Question: For a real object, which of the following can produce a real image?
(a) Plane mirror
(b) Concave mirror
(c) Concave lens
(d) Convex mirror

B

Question: A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of image, the position of object will be at
(a) 25 cm
(b) 40 cm
(c) 10 cm
(d) At infinity

C

Question: A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence (∠i). He then measures the corresponding values of the angle of refraction (∠r) and the angle of emergence (∠e) for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be :
(a) ∠i > ∠r > ∠e
(b) ∠i = ∠e > ∠r
(c) ∠i < ∠r < ∠e
(d) ∠i = ∠e < ∠r

B

Question: A student is performing the experiment of determining the focal length of a given concave mirror by focussing a distant tree on a screen. Which one of the following kinds of images he is likely to obtain on the screen ?

(a) (A)
(b) (B)
(c) (C)
(d) (D)

B

Question: Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below :
Student A : From mirror to the screen
Student B : From building to the screen
Student C : From building to the mirror
Who measured the focal length correctly ?
(a) Only A
(b) Only B
(c) A and B
(d) B and C

A

Question: If you focus the image of a distant object, whose shape

The shape of the image of this object on the screen would be :

C

Question: An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device.
(a) Convex mirror of focal length 12 cm
(b) Convex lens of focal length 24 cm
(c) Concave mirror of focal length 24 cm
(d) Convex lens of focal length 12 cm

C

Question: A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens
(a) away from the screen
(b) towards the screen
(c) to a position very far away from the screen.
(d) either towards or away from the screen depending  upon the position of the object.

D

Question: A student has focussed on the screen a distant building using a convex lens. If he has selected a blue coloured building as object, select from the following options the one which gives the correct characteristics of the image formed on the screen.
(a) Virtual, erect, diminished and green shade
(b) Real, inverted, diminished and in violet shade
(c) Real, inverted, diminished and in blue shade
(d) Virtual, inverted, diminished and in blue shade

C

Question: Select from the following the best experimental setup for tracing the path of a ray of light through a glass slab :

B

Question: Study the following four experimental setups by four students A, B, C and D showing the incident ray to trace the path of a ray of light through a glass slab.

(a) (A)
(b) (B)
(c) (C)
(d) (D)

D

Question: When you focus the image of a distant flag, whose shape is given below, on a screen using a convex lens, the shape of the image as it appears on the screen is

A

Question: In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray :
(a) is parallel to the incident ray.
(b) is along the same direction of incident ray.
(c) gets deviated and bends towards the thinner part of the prism.
(d) gets deviated and bends towards the thicker part (base) of the prism.
Answer : (d) gets deviated and bends towards the thicker part (base) of the prism.

D

Question: A student determines the focal length of a device ‘X’ by focusing the image of a distant object on a screen placed 20 cm from the device on the same side as the object.
The device ‘X’ is
(a) Concave lens of focal length 10 cm
(b) Convex lens of focal length 20 cm
(c) Concave mirror of focal length 10 cm
(d) Concave mirror of focal length 20 cm

D

Question: A teacher sets up the stand carrying a convex lens of focal length 15 cm at 42.7 cm mark on the optical bench. He asks four students A, B, C and D to suggest the position of screen on the optical bench so that a distinct image of a distant tree is obtained almost immediately on it. The positions suggested by the students were as :
A. 12.7 cm B. 29.7 cm
C. 57.7 cm D. 72.7 cm
The correct position of the screen was suggested by
(a) A
(b) B
(c) C
(d) D

C

Question: A student has traced the path of a ray of light through a glass slab as follows. If you are asked to label 1, 2, 3 and 4, the correct sequencing of labeling ∠i, ∠e, ∠r and lateral displacement respectively is :

(a) 2, 1, 3, 4
(b) 1, 2, 3, 4
(c) 1, 3, 2, 4
(d) 1, 3, 4, 2

C

Question: The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be
(a) at the focus
(b) at the centre of curvature
(c) between focus and centre of curvature
(d) beyond centre of curvature

B

Question: The nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is
(a) real, inverted and diminished
(b) virtual, erect and smaller in size
(c) real, inverted and enlarged
(d) virtual, upright and enlarged

C

Question: A concave mirror of radius 30 cm is placed in water. Its focal length in air and water differ by
(a) 15
(b) 20
(c) 30
(d) 0

D

Question: The nature of image formed by a convex mirror when the object distance from the mirror is less than the distance between pole and focal point (F) of the mirror would be
(a) real, inverted and diminished in size
(b) real, inverted and enlarged in size
(c) virtual, upright and diminished in size
(d) virtual, upright and enlarged in size

C

Question: The refractive index of transparent medium is greater than one because
(a) Speed of light in vacuum < speed of light in transparent medium
(b) Speed of light in vacuum > speed of light in transparent medium
(c) Speed flight in vacuum = speed of light in transparent medium
(d) Frequency of light wave changes when it moves from rarer to denser medium

B

Question: A divergent lens will produce
(a) always real image
(b) always virtual image
(c) both real and virtual image
(d) none of these

B

Question: The angle of incidence i and angle of refraction r are equal in a transparent slab when the value of i is
(a) 0°
(b) 45°
(c) 90°
(d) depend on the material of the slab

A

Question: You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is
(a) A
(b) B
(c) C
(d) equal in all three media

A

Question: Light from the Sun falling on a convex lens will converge at a point called
(a) centre of curvature
(b) focus
(d) optical centre

B

Question: When object moves closer to a concave lens, the image formed by it shift
(a) away from the lens on the same side of object
(b) towards the lens
(c) away from the lens on the other side of lens
(d) first towards and then away from the lens

B

Question: When an object moves closer to convex lens, the image formed by it shift
(a) away from the lens
(b) towards the lens
(c) first towards and then away from the lens
(d) first away and then towards the lens

A

Question: A magnified real image is formed by a convex lens when the object is at
(a) F
(b) between F and 2F
(c) 2F
(d) (a) and (b) both

D

Question: Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. Which of the following could be inside the box?

(a) A rectangular glass slab
(b) A convex lens .
(c) A concave lens
(d) A prism

A

Question: A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(a) – 30 cm
(b) – 20 cm
(c) – 40 cm
(d) – 60 cm

B

Question: Which of the following statements is/are true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has – 4 dioptre having a focal length 0.25 m

A

Question: Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is

A

Question: A beam of light is incident through the holes on side A and emerges out of the hole on the other face of the box as shown in the figure. Which of the following could be inside the box?

(a) Concave lens
(b) Rectangular glass slab
(c) Prism
(d) Convex lens

D

Question: In torches, search lights and headlights of vehicles the bulb is placed
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflector

B

Question: The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct?
(a) A
(b) B
(c) C
(d) D

B

Question:  The laws of reflection hold good for
(a) plane mirror only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors irrespective of their shape

D

Question:  A full length image of a distant tall building can definitely be seen by using
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror

B

Question:  In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens.

D

Question:  Magnification produced by a rear view mirror fitted in vehicles
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it.

A

Question:  If an incident ray passes through the focus, the reflected ray will
(a) pass through the pole
(b) be parallel to the principal axis
(c) retrace its path
(d) pass through the centre of curvature

B

Question:  Focal length of a concave mirror is
(a) negative
(b) positive
(c) depends on the position of object
(d) depends on the position of image

A

Question:  When light falls on a smooth polished surface, most of it
(a) is reflected in the same direction
(b) is reflected in different directions
(c) is scattered
(d) is refracted into the second medium

A

Question:  If the power of a lens is – 2 D, what is its focal length?
(a) +50 cm
(b) –100 cm
(c) –50 cm
(d) +100 cm

C

Question: Image formed by reflection from a plane mirror is
(a) real and inverted
(b) virtual and erect
(c) real and erect
(d) virtual and inverted

B

Question: Monochromatic light of frequency 5 × 1014 Hz travelling in vacuum enters a medium of refractive index 1.5. Its wavelength in the medium is
(a) 5000 Å
(b) 4000 Å
(c) 5500 Å
(d) 6000 Å

B

Question: When the object is placed between f and 2f of a convex lens, the image formed is
(a) at f
(b) at 2f
(c) beyond 2f
(d) between O and f

C

Question: Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is
(a) – 30 cm
(b) + 30 cm
(c) – 15 cm
(d) + 30 cm

A

Question: When light travels from one medium to other whose refractive index is different, then which of the given will change?
(a) Wavelength and velocity
(b) Frequency and wavelength
(c) Frequency and wavelength
(d) Frequency, wavelength and velocity

A

Question. The mirror which can form a magnified image of an object is :
(a) convex mirror
(b) plane mirror
(c) concave mirror
(d) both convex and concave mirrors

C

Question. A real image of an object is to be obtained. The mirror required for this purpose is :
(a) convex
(b) concave
(c) plane
(d) either convex or concave

B

Question. Consider two statements A and B given below :
A : real image is always inverted
B : virtual image is always erect
Out of these two statements :
(a) only A is true
(b) only B is true
(c) both A and B are true
(d) none is true

C

Question. Linear magnification (m) produced by a rear view mirror fitted in vehicles :
(a) is equal to one
(b) is less than one
(c) is more than one
(d) can be more or less than one depending on the position of object

B

Question. The image formed by a spherical mirror is virtual. The mirror will be :
(a) concave
(b) convex
(c) either concave or convex
(d) metallic

C

Question. Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be :
(a) plane
(b) concave
(c) convex
(d) either concave or convex

C

Question. The image formed by a concave mirror is real, inverted and highly diminished (much smaller than the object). The object must be :
(a) between pole and focus
(b) at focus
(c) at the centre of curvature
(d) at infinity

C

Question. The angle of incidence for a ray of light passing through the centre of curvature of a concave mirror is :
(a) 45°
(b) 90°
(c) 0°
(d) 180°

C

Question. In the concave reflector of a torch, the bulb is placed :
(a) between the pole and focus of reflector
(b) at the focus of reflector
(c) between focus and centre of curvature of reflector
(d) at the centre of curvature of reflector

B

Question. The angle between an incident ray and the plane mirror is 30°. The total angle between the incident ray and reflected ray will be :
(a) 30°
(b) 60°
(c) 90°
(d) 120°

D

Question. A ray of light is incident on a plane mirror making an angle of 90° with the mirror surface. The angle of reflection for this ray of light will be :
(a) 45°
(b) 90°
(c) 0°
(d) 60°

C

Question. The image of an object formed by a plane mirror is :
(a) virtual
(b) real
(c) diminished
(d) upside-down

A

Question. If the focal length of a spherical mirror is 12.5 less cm, its radius of curvature will be :
(a) 25 cm
(b) 15 cm
(c) 20 cm
(d) 35 cm

A

Question. The real image formed by a concave mirror is larger than the object when the object is :
(a) at a distance equal to radius of curvature
(b) at a distance less than the focal length
(c) between focus and centre of curvature
(d) at a distance greater than radius of curvature

C

Question. The real image formed by a concave mirror is smaller than the object if the object is :
(a) between centre of curvature and focus
(b) at a distance greater than radius of curvature
(c) at a distance equal to radius of curvature
(d) at a distance equal to focal length

B

Question. A ray of light travelling in air goes into water. The angle of refraction will be :
(a) 90°
(b) smaller than the angle of incidence
(c) equal to the angle of incidence
(d) greater than the angle of incidence

B

Question. The speed of light in air is :
(a) 3 × 108 cm/s
(b) 3 × 108 mm/s
(c) 3 × 108 km/s
(d) 3 × 108 m/s

D

Question. A virtual, erect and magnified image of an object is to be obtained with a convex lens. For this purpose, the object should be placed :
(a) between 2F and infinity
(b) between F and optical centre
(c) between F and 2F
(d) at F

B

Question. A burning candle whose flame is 1.5 cm tall is placed at a certain distance in front of a convex lens. An image of candle flame is received on a white screen kept behind the lens. The image of flame also measures 1.5 cm. If f is the focal length of convex lens, the candle is placed :
(a) at f
(b) between f and 2f
(c) at 2f
(d) beyond 2f

C

Question. A spherical mirror and a spherical lens each have a focal length of, –15 cm. The mirror and the lens are likely to be :
(a) both concave.
(b) both convex.
(c) the mirror is concave but the lens is convex.
(d) the mirror is convex but the lens is concave.

A

Question. When a ray of light travelling in glass enters into water obliquely :
(a) it is refracted towards the normal
(b) it is not refracted at all
(c) it goes along the normal
(d) it is refracted away from the normal

D

Question. The refractive indexes of four substances P, Q, R and S are 1.77, 1.50, 2.42 and 1.31 respectively. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in
(a) substance P
(b) substance Q
(c) substance R
(d) substance S

D

Question. If a magnification of, –1 (minus 1) is obtained by using a converging lens, then the object has to be placed :
(a) within f
(b) at 2f
(c) beyond 2f
(d) at infinity

B

Question. To obtain a magnification of, – 0.5 with a convex lens, the object should be placed :
(a) at F
(b) between optical centre and F
(c) between F and 2F
(d) beyond 2F

D

Question. The refractive index of water is :
(a) 1.33
(b) 1.50
(c) 2.42
(d) 1.36

A

Question. A diverging lens has a focal length of 0.10 m. The power of this lens will be :
(a) + 10.0 D
(b) + 1.0 D
(c) – 1.0 D
(d) – 10.0 D

D

Question. The power of a lens is + 2.0 D. Its focal length should be :
(a) 100 cm
(b) 50 cm
(c) 25 cm
(d) 40 cm

B

Question. The refractive index of water with respect to air is 4/3 . The refractive index of air with respect to water will be :
(a) 1.75
(b) 0.50
(c) 0.75
(d) 0.25

B

Question. When an object is kept at any distance in front of a concave lens, the image formed is always :
(a) virtual, erect and magnified
(b) virtual, inverted and diminished.
(c) virtual, erect and diminished
(d) virtual, erect and same size as object

C

Fill in the blanks

Question. The ratio of speed of light in vacuum to the speed of light in a medium is called ……………….

Refractive index

Question. When a ray of light travelling in glass enter into water. It is refracted ……………… the normal.

away from,

Question. A ……………… is used as a rear-view mirror.

diverging mirror.

Assertion and Reasoning Based Questions

Question. When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at the focus of :
(a) either a convex mirror or convex lens
(b) either a concave mirror or concave lens
(c) either a concave mirror or convex lens
(d) either a convex mirror or concave lens

C

Question. A lens has a focal length of, –10 cm. What is the power of the lens and what is its nature ?

–10 D ; Concave lens

Question. If an object is placed at the focus of a convex lens, where is the image formed ?

At infinity (very large distance)

Question. Where should an object be placed in order to use a convex lens as a magnifying glass ?

At a distance less than focal length

Question. The focal length of a lens is +150 mm. What kind of lens is it and what is its power ?

Convex lens ; + 6.6 D

Question. (a) What type of images can a convex lens make ?
(b) What type of image is always made by a concave lens ?

(a) Real and Virtual (b) Virtual

Question. The lens A produces a magnification of, – 0.6 whereas lens B produces a magnification of + 0.6.
(a) What is the nature of lens A ?
(b) What is the nature of lens B ?

(a) Convex lens (b) Concave lens

Question. Where should an object be placed in front of a convex lens so as to obtain its virtual, erect and magnified image ?

Within focus

Question. For what position of an object a real, diminished image is formed by a convex lens ?

Beyond 2F

Question. A diverging lens has a focal length of 3 cm. Calculate the power.

– 33.3 D

Question. The power of a lens is + 0.2 D. Calculate its focal length.

+ 5 m

Question. If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed

At focus

Question. Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image ?

Between F and 2F (or Between f and 2f)

Question. What is the nature of image formed by a concave mirror if the magnification produced by the mirror is (a) + 4, and (b) – 2 ?

(a) Virtual and erect (b) Real and inverted

Question. What is the ratio of the height of an image to the height of an object known as ?

Magnification

Question. A ray of light strikes a plane mirror at an angle of 40° to the mirror surface. What will be the angle of reflection ?

50°

Question. A ray of light is incident normally on a plane mirror. What will be the :
(a) angle of incidence ?
(b) angle of reflection ?

(a) 0° (b) 0°

Question. If an object is placed at a distance of 10 cm in from of a plane mirror, how far would it be from its image ?

20 cm

Question. Which property of light makes a pencil cast a shadow when it is held in front of a light source ?

Light travels in straight lines

Question. The image seen in a plane mirror cannot be formed on a screen. What name is given to this type of image ?

Virtual image

Question. Describe the nature of image formed when the object is placed at a distance of 20 cm from a concave mirror of focal length 10 cm.

Real and inverted

Question. If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed ?

At focus

Question. For what position of an object, a real and diminished image is formed by a concave mirror ?

Beyond centre of curvature

Question. What is the nature of a mirror having a focal length of, +10 cm ?

Convex mirror

Assertion and Reasoning Based Questions

Directions : In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as :
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true, but reason is not the correct explanation of assertion.
(c) If assertion is true, but reason is false.
(d) If assertion is false but reason is true.

Question. Assertion : Convex mirror are used for rear view on vehicles.
Reason : The size of the image formed by a convex mirror will be same.
Answer : (b) Concave mirror are not used for rear view on
vehicles. We use only convex mirrors for rear view. They will always give erect and diminished image of the object. They provide a wider field for clear view. For this reason, the convex mirrors are fitted on both sides of the vehicles. Therefore, the given assertion is true, but reason is not the correct explanation of assertion.

Question. Assertion : The sequence of rainbow colour is represented as VIBGYOR.
Reason : Formation of VIBGYOR sequence colour is due to the dispersion of white light.
Answer : (a) We know that the rainbow has seven constituent colours such as Violet, Indigo, Blue, Green, Yellow, Orange and Red. These colours are represented as VIBGYOR. It occurs due to the dispersion of white light i.e., when the white light passes through a glass prism, this phenomenon of splitting white light into VIBGYOR. Thus, option (a) is the correct answer.

Question. Assertion : A ray of light that travels obliquely from one transparent medium into another will change its direction in the second medium.
Reason : Refraction is due to change in the speed of light as it enters from one transparent medium to another.
Answer : (a) A ray of light that travels obliquely from one transparent medium to another will change its direction in the second medium. It is nothing but the process called refraction. This occurs due to change in the speed of light as it enters from one transparent medium to another.

Question. Assertion : The nature of the image formed by a concave mirror is real and inverted.
Reason : The image formed by a concave mirror depends on the position of the object at infinity.
Answer : (a) When the object is placed at an infinity position, the image formed by a concave mirror will be placed at the focus. Then the size of the image will be highly diminished and point-size. So, the nature of the image formed by the concave mirror is real and inverted. Thus, option (a) is the correct answer.

Question. Assertion : The refractive index of Kerosene is 1.44 which is optically denser than water.
Reason : The mass density of kerosene is lesser than water.
Answer : (b) We know that the refractive index of Kerosene is 1.44 and the refractive index of water is 1.33.
It shows that kerosene is optically denser than water. But the mass density of kerosene is lesser than water. So, there is no relation between mass density and optical density. Therefore, it clearly defines that an optically denser medium may not possess greater mass density. Thus, the given assertion and reason are true but reason is not the correct explanation of assertion.

Creating Based Questions

Question. Using the following information form a pathway showing the process of magnification in spherical mirror. And also include information that is not mentioned below to complete it. Magnification, spherical mirror, object image, ratio, height of image, positive, negative.
The spherical mirror magnifies → objects image to a relative extent with respect to object size. It is the ratio of → height of image → to the height of object.

Question. Using the following information form a pathway showing the reflection of a spherical mirror. And also include information that is not mentioned below to complete it. Reflecting surface, spherical mirror, curved inwards, curved outwards, pole, centre of curvature.
Answer : Spherical mirror reflections → curved inwards or outwards. The reflecting mirrors → are curved inwards → called concave mirror. The reflection surface → of convex mirror → is curved outwards. Pole is the centre of reflecting surface. The centre of spherical mirror → known as centre of curvature.

Question. Using the following information form a pathway showing the representation of an image in a spherical mirror. And also include information that is not mentioned below to complete it. Ray, centre of spherical mirror, reflection, light rays, reflecting surface.
Answer : In both concave and convex mirror → for the ray passing through the centre of curvature → the reflection is along same path. The reflection of light rays → is along same path → since the rays incident on the mirror → is normal to the reflecting surface.

Question. Using the following information form a pathway showing the formation of image by a convex mirror.
And also include information that is not mentioned below to complete it. Convex, Infinity, position of image, size of image, Nature of image, between infinity and pole.
Answer : Two positions of objects → considered in the formation of image → by a convex mirror.
Position 1 : The position of object → at infinity → position of image is at the focus of F behind the mirror, size of the image is → highly diminished and point sized. The nature of image is → virtual and erect.
Position 2 : The position of object → between infinity and pole P → displays the image position between → P and F behind the mirror. Size of the image → is diminished. Nature of the image is → virtual and erect.

Question. Using the following information form a pathway defining refractive index. And also include information that is not mentioned below to complete it. Ray of light, second medium, refractive index, speed, media, air.
Answer : The refractive index → is the extent of change in direction → in second medium of given media pair. The propagation of light travels → with different speed in different media. The speed of light in air is → comparatively less when compared to vacuum.

Paragraph/Table and Case Study Based Questions

1. Read the following and answer any four questions from 1(i) to 1(v):
Light is a form of energy that produces in us the sensation of sight. Reflection of light is the phenomenon of bouncing back of light in the same medium on striking the surface of any object.
The two laws of reflection are the incident ray, the reflected ray and the normal (at the point of incidence), all lie in the same plane and the angle of reflection (r) is always equal to the angle of incidence (i). Refraction of light is the phenomenon of change in the path of light in going from one medium to another.

(i) Mirage is caused due to………….

(a) total Internal Reflection of light by the various layers of air
(b) illusion of the presence of water
(c) result of refraction of light from a nonuniform medium
(d) during sunny days when driving on a roadway

A

(ii) What is mirage?
(a) Depends on the position of object
(b) Mirror is concave and the lens is convex
(c) Goes straight into the second medium
(d) Optical illusion caused due to total Internal Reflection

D

(iii) What are the two types of mirage?
(a) Thin mirage and thick mirage
(b) Inferior mirage and superior mirage
(c) Intense mirage and diminished mirage
(d) Light mirage and dark mirage

B

(iv) How a mirage is formed?
(a) Between focus and centre of curvature
(b) Is formed away from the normal
(c) Illusion of the presence of water and is a result of refraction of light from a nonuniform medium
(d) Is reflected along the same path

C

(v) Mirage is observed mainly during …………… days.
(a) Sunny
(b) Winter
(c) Spring
(d) Hot

A

2. Read the following and answer any four questions from 2(i) to 2(v):
Rear view mirror is a device that allows the driver to see rearward. It usually finds its place at the top of windscreen in side the cabin. This device is one of the most basic but essential safety devices in the vehicle. It provides assistance to the driver during overtaking, parking in reverse gear etc. Generally, vehicles also have a pair of mirrors attached to the body from outside. They are popular as ‘side mirrors’ or Outer Rear View Mirrors (ORVM) which serve the same purpose.
Almost all modern cars mount their side mirrors on the doors-normally at A-pillar rather than the wings (the portion of the body above the wheel well).

(i) For a real object, which of the following can produce a real image?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) None of these

B

(ii) An object at a distance of +15 cm is slowly moved towards the pole of a convex mirror. The image will get…
(a) shortened and real
(b) enlarged and real
(c) enlarge and virtual
(d) diminished and virtual

D

(iii) A convex mirror is used:
(a) by a dentist
(b) for shaving
(c) as a rear view mirror in vehicles
(d) as a light reflector for obtaining a parallel beam of light

C

(iv) The word ‘AMBULANCE’ is written on the vehicle as:
(a) CNALUBMA
(b) AMBULANCE
(c) ECNALUBMA
(d) None of these

B

(v) Mark the correct statement:
(a) Convex mirror conform images of objects spread over a large area.
(b) Convex mirrors are used by dentist.
(c) In convex mirror image is formed larger in size, erect and real.
(d) Convex mirror forms real image.

A

3. Read the following and answer any four questions from 2(i) to 2(v):

Binoculars, like telescopes, produce, magnified images of faraway objects. Figure shows a typical binocular design. Each side of the binoculars is like a small telescope: light enters a convex objective lens, which inverts the image. The light then travels through two prisms that which is used to completely reflect the incoming ray to invert the image again, so that the viewer sees an image that is upright compared to the object.

(i) Binocular is basically a:
(a) microscope
(b) telescope
(c) dispersion device
(d) magnifying glass

B

(ii) Prisms are used in binoculars:
(a) for reflection
(b) for refraction
(c) for dispersion
(d) for total internal reflection

D

(iii) Binoculars are used to see:
(a) near objects
(b) far objects
(c) both near and far object
(d) none of these

B

(iv) Refractive index of air is:
(a) 1.00
(b) 0.5
(c) 1.5
(d) 2.0

A

(v) The lens facing object in binocular is called:
(a) object lens
(b) objective lens
(c) intermediate lens
(d) eye lens

B

4. Difference between real and virtual image are shone by table :

(a) When is an image called ‘real’ ?
(b) When is an image called ‘virtual’ ?
(c) A diminished virtual image can be formed only in
(i) Plane mirror
(ii) A concave mirror
(iii) A convex mirror
(iv) Concave-parabolic mirror
(d) A virtual image larger than the object can be obtained by.
(i) Concave mirror (ii) Convex mirror
(iii) Plane mirror (iv) Concave lens
Answer : (a) When the image can be taken on a screen.
(b) When the image cannot be taken on a scream.
(c) (iii) A convex mirror
(d) (iv) Concave lens