# MCQ Chapter 10 Light Reflection and Refraction Class 10 Science

Please refer to Light Reflection and Refraction MCQ Questions Class 10 Science below. These MCQ questions for Class 10 Science with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Light Reflection and Refraction will help you to prepare for the exams and get more marks.

## Light Reflection and Refraction MCQ Questions Class 10 Science

Please see solved MCQ Questions for Light Reflection and Refraction in Class 10 Science. All questions and answers have been prepared by expert faculty of standard 10 based on the latest examination guidelines.

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

Question. What will be the angle of reflection if light falls normally on the reflecting surface?
a) 90°
b) 0°
c) – 180°
d) 180°

B

Question If in a plano-convex lens the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm then the refractive index of the material of lens will be :
a) 1.33
b) 3
c) 1.66
d) 1.5

A

Question. Refractive index of a material for infrared light is :
a) Equal to that for red colour of light
b) Equal to that for ultraviolet light
c) Less than that for ultraviolet light
d) Greater than that for ultraviolet light

C

Question. Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is :
a) 100 cm
b) 25 cm
c) 50 cm
d) 30.3 cm

C

Question. The focal length of lens depends on :
a) The radii of curvature of its surfaces
b) The refractive index of its material
c) The refractive index of the medium surrounding
d) All of the these factors

D

Question. In order to increase the magnifying power of a microscope :
a) The objective should have larger focal length and eyepiece should have small focal length
b) The focal power of the objective and the eyepiece should be larger
c) The objective should have small focal length and the eyepiece should have larger focal length
d) The focal length of the objective and the eyepiece should be large

A

Question. Light waves spreading from two sources produce interference only if they are :
a) Coherent
b) Transverse
c) Longitudinal
d) None of these

A

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. A spherical mirror and a thin spherical lens have each 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 and the lens is convex
d) the mirror is convex, but the lens is concave

A

Question. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
a) plane
b) concave
c) convex
d) either plane or convex

D

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. Which one of the following materials cannot be used to make a lens?
a) Water
b) Glass
c) Plastic
d) Clay

D

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. Convex lens focus 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. A hunter wants to shoot a fish whose image can be seen through clear water. It is to be aimed:
a) Below the image of fish
b) Above the image of fish
c) Directly towards the image
d) In any direction

A

Question. The SI unit of power of lens is
a) Joule
b) Watt
c) Dioptre
d) J/s

C

Question. A deviation in the path of a ray of light can be produced
a) by a glass prism as well as a rectangular glass slab
b) by a rectangular glass slab but not by a glass prism
c) by a glass prism but not by a rectangular glass slab
d) neither by a glass prism nor by a rectangular glass slab

A

Question. A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light:
a) Is refracted towards the normal
b) Is refracted away from the normal
c) Is reflected along the same path
d) Does not get refracted

D

Question. Light travel fastest in
a) Water
b) Air
c) Glass
d) Diamond

B

Question. An object is approaching a plane mirror at 5 cm/s. A stationary observer sees the image. At what speed will the image appear to approach the stationary observer?
a) 20 cm/s
b) 10 cm/s
c) 15 cm/s
d) 5 cm/s

D

Question. A man runs towards the plane mirror at 2 m/s. The relative speed of his image with respect to him will be:
a) 4 ms⁻¹
b) 2 ms⁻¹
c) 8 ms⁻¹
d) 10 ms⁻¹

A

Question. The image of an extended object placed in front of a concave mirror is formed at a distance of 40 cm from the object. If the image is 3 times bigger than the object, the magnitude of focal length of the mirror is
a) 15 cm
b) 10 cm
c) 20 cm
d) 5 cm

A

Question. Focal length of convex mirror whose radius of curvature is 32cm is
a) 32cm
b) 16cm
c) 28cm
d) 8cm

B

Question. Magnification in case of spherical mirrors is given by
a) M= -u/v
b) M= u/v
c) M= v/u
d) M= -v/u

D

Question. The phenomenon of spreading of light into its constituents is called as
a) Dispersion
b) Refraction
c) Interference
d) Diffraction

A

Question. Read The Following Sentences Carefully, And Choose The Incorrect One:
a) The process of sending back the light rays which fall on the surface of an object, is called reflection of light.
b) An aluminum metal is one of the worst reflectors of light.
c) The objects having polished surface reflect more light than objects having unpolished, dull surface.
d) The reflection of light in a plane mirror takes place at the silver surface in it.

B

Question. The mirror having reflection surface curved outward
a) plane mirror
b) concave mirror
c) convex mirror
d) cylindrical mirror

C

Question. The mirror having reflecting surface curved inwards
a) plane mirror
b) convex mirror
c) cylindrical mirror
d) concave mirror

D

Question. A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is :
a) parallel
b) convergent
c) divergent
d) not certain

B

Question. Concave mirror is also called as
a) Converging mirror
b) Diverging mirror
c) Both a and b
d) None

A

Question. The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called
a) reflection
b) refraction
c) dispersion
d) scattering

B

Question. A student conducts an activity using a flask of height 15 cm and a concave mirror. He finds that the image formed is 45 cm in height. What is the magnification of the image?
a) -3 times
b) -1/ 3 times
c) 1/ 3 times
d) 3 times

D

Question. The image formed by a mirror is always straight whatever will be the distance, then mirror is:
a) Only plane
b) Only concave
c) Only Convex
d) Either plane or convex

A

Question. If an object is placed symmetrically between two plane mirrors, inclined at angle of 72 degree, then total no. of images formed:
a) 5
b) 4
c) 2
d) infinite

B

Question. The ratio of sine of angle of incidence and the sine of angle of refraction is called as
a) A constant
b) Snell’s law
c) Refractive index of the medium
d) Both b and c

D

Question. Image formed by a convex spherical mirror is:
a) virtual
b) real
c) enlarged
d) inverted

A

Question. When the ray is incident at an angle of incidence 90° then
a) There will be reflection
b) There will be no reflection
c) Both a and b
d) Can’t say

B

Question. The relationship between focal length and radius of curvature is:
a) f = R
b) f = \frac{1}{R}
c) 2f = R
d) f = 2R

C

Question. Which of the following can make a parallel beam of light when light from a point source is incident on it?
a) Concave mirror as well as convex lens
b) Convex mirror as well as concave lens
c) Two plane mirrors placed at 90° to each other
d) Concave mirror as well as concave lens

A

Question. What is not a characteristic of a rear view mirror in a car?
a) Convex in nature
b) Concave in nature
c) have wider field of coverage
d) give a virtual image

B

Question. An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
a) 30 cm away from the mirror
b) 36 cm away from the mirror
c) 36 cm towards the mirror
d) 30 cm towards the mirror

B

Question. A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle θ, the spot of the light is found to move through a distance y on the scale. The angle θ is given by
a) y/x
b) x/2y
c) x/y
d) y/2x

D

Question. A glass beaker is filled with water up to 5 cm. It is kept on top of a 2 cm thick glass slab. When a coin at the bottom of the glass slab is viewed at the normal incidence from above the beaker, its apparent depth from the water surface is d cm. Value of d is close to (the refractive indices of water and glass are 1.33 and 1.5, respectively)
a) 2.5 cm
b) 5.1 cm
c) 3.7 cm
d) 6.0 cm

B

Question. A pin AB of length 2 cm is kept on the axis of a convex lens between 18 cm and 20 cm as shown in figure. Focal length of convex lens is 10 cm. Find magnification produced for the image of the pin.

a) 0.83
b) 1.00
c) 1.25
d) 6.78

C

Question. Two thin lenses of focal lengths f1 and f2 are placed in contact with each other such that the combination behaves as a glass slab. Then how are f1 and f2 related to each other?
a) f1 = 1/f2
b) f2 = –f1
c) f1 = f2
d) f1 = √f2

B

Question. A convex lens of focal length 20 cm is cut into two halves. Each of which is placed 0.5 mm and a point object placed at a distance of 30 cm from the lens as shown.

Then the image is at
a) 60 cm
b) 30 cm
c) 70 cm
d) 50 cm

A

Question. Two convex lenses A and B each of focal length 30 cm are separated by 30 cm, as shown in the figure. An object O is placed at a distance of 40 cm to the left of lens A.

What is the distance of the final image formed by this lens system?
a) 120 cm to right of lens A
b) 90 cm to right of lens A
c) 22.5 cm to right of lens B
d) 45 cm to right of lens B

C

Question. A ray of light originates from inside a glass slab and is incident on its inner surface at an angle θ as shown below.

In this experiment, the location x of the spot where the ray hits the screen is recorded. Which of the following correctly shows the plot of variation of x with the angle θ?
a) A
b) B
c) C
d) D

A

Question. Ashima looks into the mirror and sees the reflection of the picture behind her.

Which of the following is the picture that is behind Ashima ?

B

Question. A diver in a swimming pool wants to send a signal to a person lying on the edge of the pool by flashing his waterproof torch
a) He must direct the beam of light vertically upwards
b) He must direct the beam horizontally
c) He must direct the beam at an angle to the vertical which is slightly lesser than the critical angle
d) He must direct the beam at an angle to the vertical which is slightly greater than the critical angle

C

Question. A mirror is placed at an angle of 30° with respect to Y-axis (see figure). A light ray travelling in the negative y-direction strikes the mirror. The direction of the reflected ray is given by the vector 77
a) iˆ
b) iˆ − √3ˆj
c) √3iˆ −j
d) iˆ − 2 ˆj

C

Question. A doctor has prescribed a corrective lens of power + 1.5D. What type of lens it is?
a) concave
b) convex
c) bifocal
d) none of the above.

B

Question. The Angle Of Reflection Is Equal To The Angle Of Incidence:
a) Always
b) Sometimes
c) Under special conditions
d) Never

A

Question. Consider four mediums P, Q, R and S whose refractive indices are 2.14, 1.99, 2.98, and 2.16 respectively. Assume that light travels from one medium to another. The rate of change will be utmost in which medium.
a) P to Q
b) Q to R
c) R to S
d) S to P

B

Question. When the object is placed behind C in case of concave mirror then the image formed will be
a) Between F and C
b) Beyond C
c) At infinity
d) At C

C

Question. A student has focussed on the screen of 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. The power of a lens is -4.0 D. what is the nature of the lens?
a) Plane
b) Concave
c) Convex
d) Plano convex

B

Question. Which of the following statements is 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 power having a focal length 0.25 m.

A

Question. The angle of incidence is equal to the
a) Angle of glancing
b) Angle of deviation
c) Angle of reflection
d) Angle refraction

C

Question. The focal length of concave mirror is 15 cm. Its radius of curvature will be:
a) 15 cm
b) 30 cm
c) 45 cm
d) 60 cm

B

Question. Which of the following mirrors 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. 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. The image which is formed behind the mirror
a) real image
b) virtual image
c) blue image
d) partial image

B

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.

D

Question. Where should an object be placed in front of 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. When the object is placed between P and F in case of concave mirror then the image formed will be at
a) At C
b) At infinity
c) At F
d) Behind the mirror

D

Question. A magnifying glass is a
a) Both convex and concave
b) Concave lens
c) Diverging lens
d) Convex Lens

D

Question. The image obtained is always erect in
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Both a and c

D

Question. The focal length of concave mirror is 10 cm. The radius of curvature of mirror will be:
a) 10 cm
b) 20 cm
c) 30 cm
d) 40 cm

B

Question. A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:
a) at infinity
b) at focus
c) at the pole
d) behind the mirror

D

Question. The object is placed at distance 10 cm in front of a plane mirror. The distance of image from mirror will be:
a) 5 cm
b) 10 cm
c) 20 cm
d) 0 cm

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

In the following question, a statement of Assertion
(A) is followed by a statement of Reason (R). Answer these questions by selecting appropriate option given below:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.

Question. Assertion (A): A convex mirror is used as a driver’s mirror.
Reason (R): Because convex mirror’s field of view is large and images formed are virtual, erect and diminished.

A

Question. Assertion (A): For observing traffic at back, the driver mirror is convex mirror.
Reason (R): A convex mirror has much large field of view than a plane mirror.

C

Question. Assertion (A): Propagation of light through an optical fiber is due to total internal reflection taking place at the core-clade interface.
Reason (R): Refractive index of the material of the core of the optical fiber is greater than of air.

B

Question. Assertion (A): If the rays are diverging after emerging from a lens; the lens must be concave.
Reason (R): The convex lens can give diverging rays.

D

Question. Assertion (A): It is not possible to see a virtual image by eye.
Reason (R): The rays that seem to emanate from a virtual image do not in fact emanates from the image.

D

Question. Assertion (A): A virtual image cannot be photographed.
Reason (R): Only real objects are photographed.

C

Question. Assertion (A): Higher is the refractive index of a medium or denser the medium, lesser if the velocity of light in that medium.
Reason (R): Refractive index is inversely proportional to velocity.

A

Question. Assertion (A): The height of an object is always considered positive.
Reason (R): An object is always placed above the principal axis in the upward direction.

A

Question. Assertion (A): Large concave mirrors are used to concentrate sunlight to produce heat in solar cookers.
Reason (R): Concave mirror converges the light rays falling on it to a point.

A

Question. Assertion (A): The image formed by a concave mirror is certainly real if the object is virtual.
Reason: The image formed by a concave mirror is certainly virtual if the object is real.

C

(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.

Question. Assertion : The image of a point object situated at the centre of hemispherical lens is also at the centre.
Reason : For hemisphere Snell’s law is not valid.

C

Question. Assertion : Light rays retrace their path when their direction is reversed (Law of reversibility of light rays)
Reason : For the refraction of light, water is denser than air, but for the refraction of sound, water is rarer than air.

C

Question. Assertion : The mirrors used in search lights are parabolic and not concave spherical.
Reason : Silvered plano convex lens is used in search light.

C

Question. Assertion : When a concave mirror is held under water, its focal length will increase.
Reason : The focal length of a concave mirror is independent of the medium in which it is placed.

D

Question. Assertion : If a spherical mirror is dipped in water, its focal length remains unchanged.
Reason : A laser light is focused by a converging lens. There will be a significant chromatic aberration.

C

True / False :

Question. Light travels faster in glass than in air.

False

Question. The image in a plane mirror lies as far behind the mirror.

True

Question. Image formed by a plane mirror is always virtual and erect.

True

Question. Light travels in vacuum with an enormous speed of 3 × 108 ms–1.

True

Question. A ray of light passing through the optical centre of a lens will emerge without any deviation.

True

Question. The speed of light is different in different media.

True

Question. When a ray of light travels from air to water, its speeds up.

False

Question. The incident ray, the normal to the mirror at the point of incidence and the reflected ray, all lie in the same plane.

True

Question. A lens that is thicker at the middle than at the edges is a diverging lens.