# MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science

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Please refer to MCQ Questions Chapter 10 Light Reflection and Refraction Class 10 Science with answers provided below. These multiple-choice questions have been developed based on the latest NCERT book for class 10 Science issued for the current academic year. We have provided MCQ Questions for Class 10 Science for all chapters on our website. Students should learn the objective based questions for Chapter 10 Light Reflection and Refraction in Class 10 Science provided below to get more marks in exams.

## Chapter 10 Light Reflection and Refraction MCQ Questions

Please refer to the following Chapter 10 Light Reflection and Refraction MCQ Questions Class 10 Science with solutions for all important topics in the chapter.

MCQ Questions Answers for Chapter 10 Light Reflection and Refraction Class 10 Science

Question: Parallel rays, from the top of a distant tree, incident on a concave mirror, form an image on the screen. The correct diagram showing the image is

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

C

Question: Image formed by plane mirror is _______________
(a) Real and erect
(b) Real and inverted
(c) Virtual and erect
(d) Virtual and inverted

C

Question:  In an experiment to trace the path of a ray of light passing through a rectangular glass slab, four students tabulated their observations as given below.

Which student performed the experiment most correctly?
(a) A (b) B (c) C (d) D

C

Question:  The full length image of a distant tall building can be seen by using
(a) concave mirror
(b) convex mirror
(c) concave lens
(d) convex lens

B

Question:  For the refraction through a rectangular glass slab the diagram is given below.

The angle of incidence, angle of emergence and angle of refraction are respectively.
(a) X,P,M (b) X,M,P (c) Y,M,P (d) Y,N,P

B

Question:  A student determined the focal length of a device ‗X‘ by focusing a distant object on the screen as shown in the following diagram.

Select the correct option.
(a) Device ‘X‘ is a concave mirror and distance ‘d‘ is its focal length
(b) Device ‘X‘ is a concave mirror and distance ‘d‘ is its radius of curvature
(c) Device ‘X‘ is a convex lens and distance ‘d‘ is its radius of curvature
(d) Device ‘X‘ is a convex lens and distance ‘d‘ is its focal length

D

Question:  A concave mirror gives real, inverted and same size image if the object is placed at
_______________
(a) At F
(b) At infinity
(c) At C
(d) Beyond C

C

Question:  The power of the lens is +2.5D. Its focal length in cm will be
(a) + 40
(b) – 40
(c) + 80
(d) – 80

A

Question:  The magnification produced by a rear view mirror that is used in the vehicles is
(a) less than 1
(b) more than 1
(c) equal to 1
(d) less than 1 or more than 1

A

Question:  If the magnification of a lens has positive value , the image is
(a) Real
(b) virtual and erect
(c) inverted
(d) none of these

B

Question: Number of images formed when two plane mirrors are inclined at an angle 90° is
(a) 3
(b) 2
(c) 4
(d) 5   a

Question:  Which one of the following statements is not correct?
(a) A convex mirror is often used as driving rear-view mirror.
(b) A convex mirror is often used as a shaving mirror.
(c) A concave mirror is often used in a search light or a torch.
(d) A concave mirror is often used as the reflector behind lamp in a projector

B

Question: An object is at a distance of 0.5 m in front of a plane mirror. Distance between the object and image is
(a) 0.5 m
(b) 1 m
(c) 0.25 m
(d) 1.5 m

B

Question: The image formed by a convex mirror
(a) is always real
(b) is always virtual
(c) cannot say
(d) None of these

B

Question: The relation, R = 2f holds true for :
(a) concave mirrors only
(b) convex mirrors only
(c) all spherical mirrors
(d) lens as well as for all spherical mirrors.

C

Question: A magnification greater than unity indicates :
(a) real image
(b) size of the image is smaller than that of object
(c) size of the object is smaller than that of image
(d) size of object is equal to that of image

C

Question: Reciprocal of focal length of a lens gives the
(a) power
(c) magnification
(d) none of these

A

Question: In case of erect object having inverted image, linear magnification is :
(a) positive
(b) negative
(c) zero
(d) no definite sign.

B

Question: Magnification of a lens is given by
(a)imageheight/ object height
(c) 1/focal length
(d) 1/ image distance

A

Question: A man having height 2.5 m. He oberves image of 1m height erect, then mirror used is
(a) concave
(b) convex
(c) plane
(d) None of these

B

Question: If object lies symmetrically and number of images formed are 9, therefore two plane mirrors are kept at an angle of :
(a) 72°
(b) 40°
(c) 36°
(d) 50°

C

Question: Where should an object be placed in front of a convex lens to get a real image of the size of the object?
(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus.

B

Question: Find the angle of incidence and angle of reflection from the diagram.

(a) 45°, 40°
(b) 55°, 55°
(c) 60°, 60°
(d) 30°, 30°

B

Question: Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
(a) A convex lens of focal length 50 cm.
(b) A concave lens of focal length 50 cm.
(c) A convex lens of focal length 5 cm.
(d) A concave lens of focal length 5 cm.

C

Question: A man having height 2.5 m. He oberves image of 1m height erect, then mirror used is
(a) both concave.
(b) both convex.
(c) the mirror is concave and the lens is convex.
(d) the mirror is convex, but the lens is concave.

A

Question: An object is placed 60 cm in front of a concave mirror.The real image formed by the mirror is located 30 cm in front of the mirror. What is the object’s magnification?
(a) + 2
(b) –2
(c) + 0.5
(d) –0.5

D

Question: Two plane mirrors are set at right angle and a flower is placed in between the mirrors. The number of images of the flower which will be seen is
(a) One
(b) Two
(c) Three
(d) Four

C

Question: An object is situated at a distance of f/2 from a convex lens of focal length f. Distance of image will be –
(a) + (f/2)
(b) + (f/3)
(c) + (f/4)
(d) – f

D

Question: An object is placed 60 cm in front of a convex mirror. The virtual image formed by the mirror is located 30 cm behind the mirror. What is the object’s magnification
(a) + 2
(b) –2
(c) + 0.5
(d) – 0.5

C

Question: Light rays A and B fall on optical component X and come out as C and D.

The optical component is a
(a) concave lens
(b) convex lens
(c) convex mirror
(d) prism

A

Question: A man is 6.0 ft tall. What is the smallest size plane mirror he can use to see his entire image
(a) 3.0 ft
(b) 6.0 ft
(c) 12 ft
(d) 24 ft

A

Question: An object is placed 20.0 cm in front of a concave mirror whose focal length is 25.0 cm. What is the magnification of the object?
(a) + 5.0
(b) – 5.0
(c) + 0.20
(d) – 0.20

A

Question: If the refractive indices for water and diamond relative to air are 1.33 and 2.4 respectively, then the refractive index of diamond relative to water is –
(a) 5.5
(b) 1.80
(c) 3.19
(d) None of these

B

Question: There is an equiconvex lens of focal length of 20 cm. If the lens is cut into two equal parts perpendicular to the principle axis, the focal lengths of each part will be
(a) 20 cm
(b) 10 cm
(c) 40 cm
(d) 15 cm

C

Question: An object is placed 20.0 cm in front of a concave mirror whose focal length is 25.0 cm. Where is the image located?
(a) 1.0 × 102 cm in front of the mirror
(b) 1.0 × 102 cm behind the mirror
(c) 5.0 × 101 cm in front of the mirror
(d) 5.0 × 101 cm behind the mirror

B

Question: An object is placed at the radius of curvature of a concave spherical mirror. The image formed by the mirror is
(a) located at the focal point of the mirror.
(b) located between the focal point and the radius of curvature of the mirror.
(c) located at the center of curvature of the mirror.
(d) located out beyond the center of curvature of the mirror.

C

Question: Which statement best describes the property of light waves illustrated in the diagram below?

(a) Some materials absorb light waves.
(b) Some materials reflect light waves.
(c) Light waves are refracted by some materials.
(d) Light waves are emitted by some materials.

C

Question: What are the factors that determine the angle of deviation in a prism?
(a) angle of incidence
(b) wave length
(c) angle of the prism
(d) All the above

D

Question: Morning sun is not so hot as the mid day sun because
(a) Sun is cooler in the morning
(b) Heat rays travel slowly is the morning
(c) It is God gift
(d) The sun’s rays travel a longer distance through atmosphere in the morning

D

Question: Light waves
(a) require air or another gas to travel through
(b) require an electric field to travel through
(c) require a magnetic field to travel through
(d) can travel through perfect vacuum

D

Question: An object is placed in front of a concave mirror of focal length 50.0 cm and a real image is formed 75 cm in front of the mirror. How far is the object from the mirror
(a) 25 cm
(b) 30 cm
(c) 150 cm
(d) –150 cm

D

Question:  A number of images of a candle flame can be seen in a thick plane mirror. The brightest image is
(a) Fourth
(b) Second
(c) Last
(d) First

B

Question: The layered lens shown below is made of two different transparent materials.

A point object is placed on its axis. The object will form
(a) one image
(b) infinite images
(c) no image
(d) two images

D

Question: Under what conditions does a diverging lens form a virtual image of a real object
(a) Only if u > f.
(b) Only if u < f.
(c) Only if u = f
(d) A diverging lens always forms a virtual image of a real object.

D

Question: A concave spherical mirror has a radius of curvature of 100 cm. What is its focal length
(a) 50 cm
(b) 100 cm
(c) 200 cm
(d) 300 cm

A

Question:  If the speed of light in medium –1 and medium –2 are 2.5 × 108 ms–1 and 2 × 108 ms–1, respectively, then the refractive index of medium – 1 with respect to medium –
2 is _________.
(a) 3/2.5
(b) 2/2.5
(c) 2.5/3
(d) 2.5/2

B

Question: A ray from air enters water, then through a thick layer of glass placed below water. After passing through glass, it again comes out in air medium. Then final emergent ray will
(a) Bend towards the normal
(b) Suffer lateral displacement
(c) Have the same path as if it had not passed through glass and water.
(d) None of these

B

Question:  A lens produces a enlarged, virtual image. What kind of lens is it?
(a) converging
(b) diverging
(c) It could be either diverging or converging.
(d) None

A

Question: Light is incident on an air-water interface at an angle of 25° to the normal. What angle does the refracted ray make with the normal
(a) 19°
(b) 34°
(c) 25°
(d) 90°

A

FILL IN THE BLANKS

Question: The power of a convex lens is …………….. and that of a concave lens is …………..

positive, negative.

Question: Light seems to travel in ……………

straight lines.

Question: The reflecting surface of a spherical mirror may be curved ………….. or …………..

inwards, outwards.

Question: In case of a rectangular glass slab, the refraction takes place at both ……………… interface and …………… interface. The emergent ray is ……….. to the direction of incident ray.       air-glass, glass-air, parall

air-glass, glass-air, parall

Question: Power of a lens is the reciprocal of its ……………..  focal length

focal length

Question: The SI unit of power of a lens is …………….

dioptre

Question: The centre of curvature of a concave mirror lies in ………. of it.

front

Question: The angle of incidence is ……… to the angle of reflection.

equal

Question: A light ray travelling obliquely from a denser medium to a rarer medium bends …………. the normal. A light ray bends………….. the normal when it travels obliquely from a rarer to a denser medium.

away from, towards

Question: The centre of the reflecting surface of a spherical mirror is a point called the …………….

pole

Question: Line passing through the pole and the centre of curvature of a spherical mirror is called the ……………

principal axis

Question: An object is placed in front of a spherical mirror. The image is found to be virtual for all positions of the object. The spherical mirror is ………

convex

Question: A ray parallel to the principal axis, after reflection, will pass through the ………………..

principal focus

Question: The dentists use …………… mirrors to see large images of the teeth of patients.

concave

Question: The degree of …………. of light rays achieved by a lens is expressed in terms of its power.

convergence or divergence

Question: A transparent material bound by two surfaces, of which one or both surfaces are spherical, forms a ………..

lens.

Question: Two immiscible transparent liquids A and B have 1.2 and 1.5 as their refractive indices (with respect to air). The refractive index of B with respect to A is ……..

5/4

Question: Focal length of the lens is 50cm, its Power is _____________

2D

Question: Velocity of light in air is _____________

3×108 m/s

Question: A concave mirror gives virtual, and enlarged image of the object when the object is
_____________

between P and F

Question: The mirror used in construction of shaving glass is_____________

concave

Question: In optics an object which has higher refractive index is called _____________

Denser medium

ASSERTION AND REASONING

In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(c) Assertion is true but Reason is false.
(d) Both Assertion and Reason are false.

Question: Assertion: Light travels faster in glass than in air.
Reason: Glass is denser than air

D

Question: Assertion: Refractive index has no units.
Reason: The refractive index is the ratio of two dissimilar units.

A

Question: Assertion: For observing traffic at back, the driver mirror is convex mirror.
Reason: A convex mirror has larger field of view has plane mirror.

A

Question: Assertion: The mirrors used in searchlights are concave spherical.
Reason: In concave spherical mirror the image formed is always virtual.

C

Question: Assertion: The height of the object is always positive
Reason: The object is always placed above the principal axis in the upward direction

A

Question: Define focal length of a spherical mirror.

The distance between pole and focus point is called focal length.

Question:  Give two uses of concave mirror.

concave mirror is used in torch light, solar furnace

Question:  Define absolute refractive index.

Refractive index of a medium with respect to vacuum is called the absolute refractive index

Question:  A ray of light travelling in air enters obliquely into water, Does the light ray bend towards or away from the normal?

Light rays bends towards the normal

True / False :

Question. The refractive index of a transparent medium is the ratio of the speed of light in vacuum to that in the medium.

True

Question. The mirror formula is valid only if the aperture of the mirror is small.

True

Question. An object is placed in front of a mirror and an image of it is formed at the object itself. The mirror mentioned in the question is a convex mirror.

False

Question. A concave mirror can produce both real and virtual images.

True

Question. The reflecting surfaces, of all types, obey the laws of reflection.

True

Question. A concave lens will always give a virtual, erect and diminished image.

True

Question. The laws of reflection are valid for plane mirrors and not for spherical mirrors.

False

Question. Convex mirrors enable the driver to view much larger area than would be possible with a plane mirror.