# Unseen Passage

For Class 4 to Class 12

# Light Reflection and Refraction MCQ Class 10 Science

Please refer to Chapter 10 Light Reflection and Refraction MCQ Class 10 Science with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 10 Science. Students should refer to MCQ Questions for Class 10 Science with Answers to score more marks in Grade 10 Science exams. Students should read the chapter Light Reflection and Refraction and then attempt the following objective questions.

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

The Light Reflection and Refraction MCQ Class 10 Science provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams

Question. Air is not visible because it-
(A) is nearly a perfectly transparent
(B) neither absorbs nor reflects light
(C) transmits whole of light
(D) all of the above are correct

D

Question. An object is immersed in a fluid. In order that the object becomes invisible, it should
(A) behave as a perfect reflector
(B) absorb all light falling on it
(C) have refractive index one
(D) have refractive index exactly matching with that of the surrounding fluid.

D

Question. R.I. of glass w.r.t. air is 3/2, then the R.I. of air w.r.t. glass is-
(A) 3/4
(B) 2/3
(C) 1/3
(D) 3

B

Question.The focal length of a concave mirror is f and the distance of the object from the principal focus is a. The magnitude of magnification obtained will be-
(A) (f + a)/f
(B) f /a
(C) √f / √a
(D) f2/a2

B

Question.A child walks towards a fixed plane mirror at a speed of 5 km h–1. The velocity of the image with respect to mirror is –
(A) 5 km h–1
(B) –5 km h–1
(C) 10 km h–1
(D) –10 km h–1

B

Question. Light shows –
(A) Random propagation
(B) Curvilinear propagation
(C) Rectilinear propagation
(D) None of these

C

Question. One surface of a lens is convex and the other is concave. If the radii of curvature are r1 and r2 respectively, the lens will be convex, if-
(A) r1 > r2
(B) r1 = r2
(C) r1 < r2
(D) r1 = 1/r2

C

Question. The letter that does not show lateral inversion-
(A) Z
(B) M
(C) O
(D) W

A

Question. A ray of light is incident normally on a rectangular piece of glass. The value of angle of refraction will be-
(A) 180°
(B) 90°
(C) 45°
(D) 0°

D

Question. What is the angle of deviation ?
(A) Angle between the reflected ray and incident ray
(B) Angle between the reflected ray and refracted ray
(C) Angle between the incident ray and refracted ray
(D) angle between the incident ray and emergent ray

D

Question. A ray of light is incident on a plane mirror at an angle Θ. If the angle between the incident and reflected rays is 80°, what is the value of Θ.
(A) 40°
(B) 50°
(C) 45°
(D) 55°

B

Question. The focal length of a lens of power –2.0 D is-
(A) –2.0 m
(B) 0.2 m
(C) –0.5 m
(D) 0.5 m

C

Question. Two lenses of power + 5D and –5D are placed in close contact. The focal length of the combination is-
(A) Zero
(B) ∞
(C) Zero or ∞
(D) None of these

B

Question. In a plane mirror, an object is 0.5 m in front of the mirror. The distance between object and image is –
(A) 0.5 m
(B) 1 m
(C) 0.25 m
(D) 0.75 m

B

Question. The path along which light travels in a homogeneous medium is called a-
(A) beam of light
(B) ray of light
(C) pencil of light
(D) none of these

B

Question. Focal length of coloured goggles (Without number) is-
(A) zero
(B) infinity
(C) between zero and infinity
(D) None of these

B

Question. Where should an object be placed so that a real and inverted image of very large size is obtained, using a convex lens ?
(A) At the focus
(B) At 2F
(C) Between F and 2F
(D) Beyond 2F

A

Question. Which among the following is true for a plane mirror?
(A) Angle of incidence is the angle between incident ray and the mirror surface.
(B) Angle of incidence is the angle between the reflected ray and the incident ray.
(C) Angle of incidence is not always equal to angle of reflection.
(D) Angle of incidence is always equal to angle of reflection.

D

Question. Total internal reflection of light is possible when light enters from:
(A) Water to air
(B) Air to water
(C) Vacuum to air
(D) Air to glass

A

Question. Virtual image forms
(A) When rays of light converge.
(B) When rays of light do not actually meet, but appear to meet when produced backwards.correct
(C) When rays of light actually meet.
(D) When rays of light meet on the back side of mirror.

A

Question. The focal length of plane mirror is:
(A) Zero
(B) Infinite
(C) 25 cm
(D) 25 cm

B

Question. No matter how far or close you stand from a mirror, your image is always virtual and erect. The mirror is
(A) convex mirror
(B) plane mirror
(C) concave mirror
(D) either a convex or a plane mirror

D

Question. Transparent medium is one:
(A) Which partially allows light to pass through
(B) Which absorbs most of the light
(C) Which allows most of the light to pass through
(D) None of these

C

Question. The order of colours arranged in spectrum of white light is expressed as:
(A) VIBGYOR
(B) VIBYGOR
(C) VIBGOYR
(D) VIGBYOR

A

Question. Which mirroji can produce a virtual, erect and magnified ifhage of an object?
(A) Concave mirror
(B) Convex mirror
(C) Plane mirror
(D) Both concave and convex mirrors

A

Question. The mirrors used in shopping malls are
(A) Concave mirror
(B) Plane mirror
(C) Convex mirror
(D) Both a and b

C

Question. According to laws of reflection of light –
(A) Angle of incidence is equal to the angle of reflection
(B) Angle of incidence is less than the angle of reflection
(C) Angle of incidence is greater than the angle of reflection
(D) None of these

A

Question. A light ray falls on a mirror and deviates by 60° then the angle of reflection will be
(A) 30°
(B) 90°
(C) 60°
(D) 180°

C

Question. The magnification of an object placed 10 cm from a convex mirror of radius of curvature 20 cm will be-
(A) 0.2
(B) 0.5
(C) 1
(D) infinity

B

Question. A plane mirror is approaching you at 10 cm s–1. Your image shall approach you with a speed of-
(A) + 10 cm s–1
(B) – 10 cm s–1
(C) + 20 cm s–1
(D) – 20 cm s–1

C

Question. In case of a real and inverted image, the magnification of a mirror is
(A) positive
(B) negative
(C) zero
(D) infinity

B

Question. Images formed by an object placed between two plane mirrors whose reflecting surfaces make an angle of 90° with one another lie on a
(A) Straight line
(B) Zig-zag curve
(C) Circle
(D) Ellipse

C

Question. Two lenses of focal length f1 and f2 are kept in contact coaxially. The power of the combination will be
(A) f1 f2/f1 + f2
(B) f1 + f2/f1 f2
(C) f1 f2/f1 – f2
(D) f1 + f2

B

Question. Two plane mirrors are kept on a horizontal table making an angle θ with each other as shown schematically in the figure. The angle θ is such that any ray of light reflected after striking both the mirrors returns parallel to its incident path. For this to happen, the value of θ should be

(A) 30°
(B) 45°
(C) 60°
(D) 90°

D

Question. A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 12 cm. Which of the following object distance should be chosen for this purpose?
(A) 10 cm
(B) 14 cm
(C) 18 cm
(D) 24 cm

A

Question. Focal length of a lens is 25 cm. In dioptre, power of lens will be
(A) 0.04
(B) 0.4
(C) 4
(D) 2.5

C

Question. Refraction of light from air to glass and from air to water are shown in figure (i) and (ii) below. The value of the angle in the case of refraction as shown in figure (iii) will be :

(A) 30°
(B) 35°
(C) 60°
(D) none of the above

B

Question. A convex lens of focal length 25 cm receives light from the sun. A diverging lens of focal length – 12 cm is placed 37 cm to the right of the converging lens. Where is the final image located relative to the diverging lens?
(A) 6 cm to the left
(B) 25 cm to the left
(C) At infinity
(D) 12 cm to the right

A

Question. A camera lens focuses light from a 12.0 m tall building located 35.0 m away on film 50.0 mm behind the lens. How tall is the image of the building on the film?
(A) 17.1 mm
(B) 7.00 mm
(C) 2.50 cm
(D) 1.25 mm

A

Question. A hollow lens is made of thin glass and in the shape of a double concave lens. It can be filled with air, water of refractive index 1.33 or CS2 of refractive index 1.6. It will act as a diverging lens, if it is
(A) filled with air and immersed in water
(B) filled with water and immersed in CS2
(C) filled with air and immersed in CS2
(D) filled with CS2 and immersed in water

D

Question. The power of a lens whose focal length is 25 cm is-
(A) 4 Diopter
(B) 25 Diopter
(C) 0.04 Diopter
(D) 2.5 Diopter

A

Question. Which one of the following materials cannot be used to make a lens?
(A) Water
(B) Glass
(C) Plastic
(D) Clay

D

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. 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. In torches, search lights and head lights of vehicles the bulb is placed
(A) Between pole and focus
(B) Very near to the focus
(C) Between focus and centre of curvature
(D) At centre of curvature

B

Question. 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. Assertion: Pupil is black in colour.
Reason: Pupil is black in colour as no light is reflected in it.
(A) Both A and R are true and R is the correct explanation of A.
(B) Both A and R are true but R is not the correct explanation of A.
(C) A is true but R is false.
(D) A is false but R is true.
(E) Both A and R are false.

A

Question. Assertion: The rainbow is a man made spectrum of sunlight in the sky.
Reason: The rainbow is formed in the sky when the sun is shining and it is raining at the same time.
(A) Both A and R are true and R is the correct explanation of A.
(B) Both A and R are true but R is not the correct explanation of A.
(C) A is true but R is false.
(D) A is false but R is true.
(E) Both A and R are false.

A

Question. When a ray of light goes from one medium to another, there is
(A) Always a change in its speed as well as direction
(B) No change in speed and direction
(C) A change in speed but no change in direction
(D) A change in direction but constant speed.

A

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. 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. The angle of incidence i and 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. 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. Light from the Sun falling on a convex lens will converge at a point called
(A) centre of curvature
(B) focus
(C) radius of curvature
(D) optical centre

B

Question. When object moves closer to a concave lens the image by it shift
(A) away from the lens on the same side of object
(B) toward the lens
(C) away from the lens on the other side of lens
(D) first towards and then away from the lens

B

Question. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
(A) Between the principal focus and the centre of curvature.
(B) At the centre of curvature
(C) Beyond the centre of curvature
(D) Between the pole of the mirror and its principal focus.

D

Question. A spherical mirror and thin spherical lens have each of focal length of -15 cm. the mirror and lens are likely to be
(A) Both concave
(B) Both convex
(C The mirror is concave and the lens is convex
(D) The mirror is convex and lens is concave.

A

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. If the magnification produced by a lens has a negative value, the image will be
(A) virtual and inverted
(B) virtual and erect
(C) real and erect
(D) real and inverted

B

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. Light always travels along a
(A) Zigzag path
(B) Straight line path
(C) Curved path
(D) Circular path

B

Question. Light with wavelength of 6000 A0 units has a frequency :
(A) 5 x 10¹⁷ Hz
(B) 5 x 10¹⁶ Hz
(C) 5 x 10¹⁵ Hz
(D) 5 x 10¹⁴ Hz

D

Question. A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be
(A) both concave
(B) both convex
(C) the mirror is concave and the lens is convex
(D) the mirror is convex and the lens is concave

A

Question. The image t due to convex mirror is always
(A) Real
(B) Virtual
(C) Real and erect
(D) Virtual and erect

D

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

C

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

C

Question. The optical phenomena, twinkling of stars, is due to
(A) Atmospheric reflection
(B) Total reflection
(C) Atmospheric refraction
(D) Total refraction

C

Question. The focal length of a concave mirror is f and the distance of the object to the principal focus is p . Then the ratio of the size of the image to the size of the object is :
(A) p/p
(B) p/f
(C) fp
(D) (?pf)

A

Question. A blue object on a white background when seen through a blue filter will appear :
(A) Black on a blue background
(B) Blue on a white background
(C) Blue on a red background
(D) Invisible

D

Question. When two plane mirrors are placed parallel and facing each other and an object is kept in between them, we get infinite images. But actually only a few images are visible because the intensity of the image is
(A) Increased after each reflection
(B) Decreased after each reflection
(C) Always constant
(D) None of these

B

Question. Under which of the following conditions a concave mirror can form an image larger than the actual object?
(A) When the object is kept at a distance equal to its radius of curvature
(B) When object is kept at a distance less than its focal length
(C) When object is placed between the focus and centre of curvature
(D) When object is kept at a distance greater than its radius of curvature

C

Question. An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is:
(A) Less than 100 mm
(B) Between 100 mm and 200 mm
(C) Exactly 200 mm
(D) More than 200 mm

D

Question. The number of images observable between two parallel mirrors is :
(A) 2
(B) 4
(C) 6
(D) Infinity

D

Question. An observer moves towards a stationary plane mirror at a speed of 4m/s. The speed of image with respect to mirror is __________.
(A) 4m/s towards the mirror
(B) 4 m/s away from the mirror
(C) 8 m/s away from the mirror
(D) 8 m/s towards the mirror

A

Question. The mirrors used by dentist are
(A) Convex mirror
(B) Plane mirror
(C) Concave mirror
(D) Both a and c

C

Question. Four optical media A, B, C and D have optical densities 1.35, 1.21, 1.58 and 1.002 respectively. In which optical medium will the light travel fastest?
(A) A
(B) B
(C) C
(D) D

D

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. 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 0.25 m

C

Question. The refractive index of transparent medium is greater than one because
(A) Speed of light in vacuum < speed of light in tansparent medium
(B) Speed of light in vacuum > speed of light in tansparent medium
(C) Speed flight in vacuum = speed of light in tansparent medium
(D) Frequency of light wave changes when it moves from rarer to denser medium

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