Light Reflection and Refraction Quiz

Question 1

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:

Accepted Answer

2 cm

Answer

4 cm

Answer

10 cm

Answer

22 cm

Question 2

Focal length of plane mirror is

Accepted Answer

At infinity

Answer

Zero

Answer

Negative

Answer

None of these

Question 3

Which of the following can make a parallel beam of light when light from a point source is incident on it?

Accepted Answer

Concave mirror as well as convex lens

Answer

Convex mirror as well as concave lens

Answer

Two plane mirrors placed at 90° to each other

Answer

Concave mirror as well as concave lens

Question 4

In order to obtain a magnification of, -0.6 (minus 0.6) with a concave mirror, the object must be placed:

Accepted Answer

Beyond the center of curvature

Answer

At the focus

Answer

Between pole and focus

Answer

Between focus and center of curvature

Question 5

A ray of light that strikes a plane mirror PQ at an angle of incidence of 30⁰, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:

Accepted Answer

60⁰

Answer

30⁰

Answer

45⁰

Answer

90⁰

Question 6

Image formed by plane mirror is

Accepted Answer

Virtual and erect

Answer

Real and erect

Answer

Real and inverted

Answer

Virtual and inverted

Question 7

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

Accepted Answer

-20 cm

Answer

-30 cm

Answer

-40cm

Answer

-60 cm

Question 8

A man runs towards the plane mirror at 2 m/s. The relative speed of his image with  respect to him will be:

Accepted Answer

4 ms⁻¹

Answer

2 ms⁻¹

Answer

8 ms⁻¹

Answer

10 ms⁻¹

Question 9

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:

Accepted Answer

More than 200 mm

Answer

Less than 100 mm

Answer

Between 100 mm and 200 mm

Answer

Exactly 200 mm

Question 10

A concave mirror gives real, inverted and same size image if the object is placed

Accepted Answer

At C

Answer

At F

Answer

At infinity

Answer

Beyond C

Question 11

Under which of the following conditions a concave mirror can form an image larger than the actual object?

Accepted Answer

When object is placed between the focus and centre of curvature

Answer

When the object is kept at a distance equal to its radius of curvature

Answer

When object is kept at a distance less than its focal length

Answer

When object is kept at a distance greater than its radius of curvature

Question 12

A concave lens form the image of an object which is :

Accepted Answer

Virtual upright and diminished

Answer

Virtual inverted and diminished

Answer

Virtual inverted and enlarged

Answer

Virtual upright and enlarged

Question 13

Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?

Accepted Answer

10 cm

Answer

20 cm

Answer

30 cm

Answer

35 cm

Question 14

Power of the lens is -40, its focal length is

Accepted Answer

-0.25m

Answer

4m

Answer

-40m

Answer

-25m

Question 15

The diagrams showing the correct path of the ray after passing through the

Accepted Answer

I, II and III

Answer

II and III only

Answer

I and II only

Answer

I, II and IV

Question 16

Which of the given is NOT paired correctly?

Accepted Answer

None of these

Answer

Solar furnace-concave mirror

Answer

Rear -view mirror-convex mirror

Answer

Magnifying glass -convex lens

Question 17

A concave mirror produces a magnification of +4. The object is placed:

Accepted Answer

Between focus and pole

Answer

At the focus

Answer

Between focus and centre of curvature

Answer

Beyond the centre of curvature

Question 18

A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is

Accepted Answer

Between P and F

Answer

At infinity

Answer

Between F and C

Answer

At E

Question 19

A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be

Accepted Answer

greater than unity

Answer

less than unity

Answer

equal to unity

Answer

zero

Question 20

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?

Accepted Answer

10 cm/s

Answer

20 cm/s

Answer

15 cm/s

Answer

5 cm/s

Question 21

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:

Accepted Answer

Mirror A is concave and mirror B is plane

Answer

Mirror A is concave and mirror B is convex

Answer

Mirror A is plane and mirror B is concave

Answer

Mirror A is convex and mirror B is concave

Question 22

In optics an object which has higher refractive index is called

Accepted Answer

Optically denser

Answer

Optically rarer

Answer

Optical density

Answer

Refractive index

Question 23

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?

Accepted Answer

A rectangular glass slab

Answer

A convex lens

Answer

A concave lens

Answer

A prism

Question 24

Refractive index:

Accepted Answer

Depends on the wavelength of light used to measure

Answer

Is actual property of the substance

Answer

Depends on the angle of incidence

Answer

None of these

Question 25

A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light:

Accepted Answer

Does not get refracted

Answer

Is refracted towards the normal

Answer

Is refracted away from the normal

Answer

Is reflected along the same path

Question 26

The optical phenomena, twinkling of stars, is due to

Accepted Answer

Atmospheric refraction

Answer

Atmospheric reflection

Answer

Total reflection

Answer

Total refraction

Question 27

Which of the following statements is true?

Accepted Answer

A convex lens has 4 dioptre power having a focal length 0.25 m

Answer

A convex lens has -4 dioptre power having a focal length 0.25 m

Answer

A concave lens has 4 dioptre power having a focal length 0.25 m

Answer

A concave lens has -4 dioptre power having a focal length 0.25 m.

Question 28

A hunter wants to shoot a fish whose image can be seen through clear water. It is to be aimed:

Accepted Answer

Below the image of fish

Answer

Above the image of fish

Answer

Directly towards the image

Answer

In any direction

Question 29

A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:

Accepted Answer

90⁰

Answer

120⁰

Answer

45⁰

Answer

0⁰

Question 30

Convex lens focus a real, point sized image at focus, the object is placed

Accepted Answer

At infinity

Answer

At focus

Answer

Between F and 2F

Answer

At 2F

Question 31

Magnification produced by a rear view mirror fitted in vehicles

Accepted Answer

is less than one

Answer

is more than one

Answer

is equal to one

Answer

can be more than or less than one depending upon the position of the object in front of it.

Question 32

On heating a liquid the refractive index generally:

Accepted Answer

Decreases

Answer

Increases

Answer

Does not change

Answer

Increases or decreases depending upon rate of heating

Question 33

A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is:

Accepted Answer

16 cm

Answer

8 cm

Answer

24 cm

Answer

36 cm

Question 34

The unit of power of lens is

Accepted Answer

Diopter

Answer

Meter

Answer

Centimeter

Answer

M-1

Question 35

Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

Accepted Answer

30 cm in front of the mirror

Answer

15 cm in front of the mirror

Answer

between 15 cm and and 30 cm in front of the mirror

Answer

more than 30 cm in front of the mirror

Question 36

A lens has a power of +0.5D. It is:

Accepted Answer

A convex lens of focal length 2 m

Answer

A concave lens of local length 5 m

Answer

A convex lens of focal length 5 m

Answer

A concave lens of focal length 2 m

Question 37

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is:

Accepted Answer

10 cm

Answer

20 cm

Answer

18 cm

Answer

5 cm

Question 38

The radius of curvature of a mirror is 20cm the focal length is

Accepted Answer

10cm

Answer

20cm

Answer

40cm

Answer

5cm

Question 39

A full length image of a distant tall building can definitely be seen by using

Accepted Answer

a convex mirror

Answer

a concave mirror

Answer

a plane mirror

Answer

both concave as well as plane mirror

Question 40

In torches, search lights and headlights of vehicles the bulb is placed

Accepted Answer

very near to the focus of the reflector

Answer

between the pole and the focus of the reflector

Answer

between the focus and centre of curvature of the reflector

Answer

at the centre of curvature of the reflector

Question 41

In which of the given cases do we get very strong reflected rays and very weak refracted rays ?

Accepted Answer

Light passing from water to air

Answer

Light passing from air to glass

Answer

Light passing from water to glass

Answer

Light passing from glass to diamond

Question 42

In order to increase the magnifying power of a microscope :

Accepted Answer

The objective should have larger focal length and eyepiece should have small focal length

Answer

The focal power of the objective and the eyepiece should be larger

Answer

The objective should have small focal length and the eyepiece should have larger focal length

Answer

The focal length of the objective and the eyepiece should be large

Question 43

A student traces the path of a ray of light passing through a rectangular slab for three different values of angle of incidence (∠i ) namely 30⁰, 45⁰ and 60⁰. He extends the direction of incident ray by a dotted line and measures the perpendicular distance ‘l’ between the extended incident ray and the emergent ray.
He will observe that:

Accepted Answer

‘l’ keeps on increasing with increase in angle of incidence

Answer

‘l’ keeps on decreasing with increase in angle of incidence

Answer

‘l’ remains the same for all three angles of incidence

Answer

‘l’ is the maximum for ∠i = 45o and is less than this value for ∠i = 30o and ∠i = 60o.

Question 44

The image which is formed behind the mirror

Accepted Answer

virtual image

Answer

real image

Answer

blue image

Answer

partial image

Question 45

Convex lens is also known as

Accepted Answer

converging lens

Answer

diverging lens

Answer

radial lens

Answer

axial lens

Question 46

Using a convex lens, a clear image of candle flame is produced on a screen. How many other clear images can be received on this screen if only the lens is to be shifted ?

Accepted Answer

Only one more

Answer

A large number

Answer

Two more

Answer

None of these

Question 47

A parallel beam of light is incident on a converging lens parallel to its principal axis. As we move away from the lens on the other side on its principal axis the intensity of light

Accepted Answer

First increases and then decreases

Answer

Remains constant

Answer

Continuously increases

Answer

Continuously decreases

Question 48

The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called

Accepted Answer

refraction

Answer

reflection

Answer

dispersion

Answer

scattering

Question 49

The laws of reflection hold good for

Accepted Answer

all mirrors irrespective of their shape

Answer

plane mirror only

Answer

concave mirror only

Answer

convex mirror only

Question 50

You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?

Accepted Answer

Glycerin

Answer

Kerosene

Answer

Water

Answer

Mustard oil

Question 51

When white light moves through vacuum :

Accepted Answer

All colors have the same speed

Answer

Violet has greater speed than red

Answer

Red has greater speed than violet

Answer

Different colors have different random speeds

Question 52

Magnifying power of a compound microscope is the ratio of the angle formed by the final image to the angle formed by the object when :

Accepted Answer

Object is placed at the least distance of distinct vision and image may be at any place

Answer

Image is at the least distance of distinct vision and object may be anywhere

Answer

Object and image are both at infinity

Answer

Object and image are both at the least distance of distinct vision

Question 53

Spherical air bubble in water will act as :

Accepted Answer

A concave lens

Answer

A convex lens

Answer

Plane-concave lens

Answer

Plane glass plate

Question 54

A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

Accepted Answer

Concave, plane and convex

Answer

Plane, convex and concave

Answer

Convex, concave and plane

Answer

Convex, plane and concave

Question 55

A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown alongside in the diagram. Select the correct statement about the device (X).

Accepted Answer

This device is a convex lens of focal length 8 cm.

Answer

This device is a concave lens of focal length 8 cm.

Answer

This device is a convex mirror of focal length 8 cm.

Answer

This device is a convex lens of focal length 4 cm.

Questions in this Quiz

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Light Reflection and Refraction Quiz

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