Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 26

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Question 1
1 / -0

If a ray of light goes from a rarer medium to a denser medium , will it bend towards the normal or away from it ?

A
bends away from the normal

B
bends towards the normal

C
goes undeviated

D
is reflected back

Solution

Refraction is the bending of light rays after entering a medium where its speed is different. Due to refraction of light, when a ray of light passes from a rarer medium to a denser medium, bends towards the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media. Hence, when a ray of light from air enters a denser medium, it bends towards the normal.
Question 2
1 / -0

The focal length of a lens is $$-0.4\ m$$. The lens is:

A
Convex only

B
Concave only

C
It may be convex or conacve

D
None of these

Solution

The focal length of the concave lens is negative because its primary focus is to the left of the lens.
Question 3
1 / -0

The focal length can be expressed in:

A
metre

B
Dioptre

C
Watt

D
Horse power

Solution

The focal length is associated with distance. So, it can be expressed in metre.
Question 4
1 / -0

A ray of light is incident perpendicularly on a glass slab. The angle of incidence is :

A
$$0^{\circ}$$

B
$$45^{\circ}$$

C
$$90^{\circ}$$

D
$$180^{\circ}$$

Solution

The angle of incidence is the angle between the incident ray and the normal. if the ray is incident on the surface normally, this angle is 0; hence correct answer is A.
Question 5
1 / -0

The phenomenon due to which a ray of light .......... from its path while travelling from one optical medium to another optical medium is called refraction.

A
reflected

B
deviates

C
normally

D
less

Solution

Deviates
Refraction is a phenomenon in which when a ray passes from one medium to another it bends away from its straight-line path due to the difference in optical densities or refractive indices of the two mediums. This bending is known as deviation.
Question 6
1 / -0

.................. ray is the ray of light striking the surface of a reflector.

A
Incident

B
refracted

C
reflected

D
All the above

Solution

An incident ray is the ray of light that strikes the surface of a reflector.
Question 7
1 / -0

Convex lens is always :

A
tapering at edges

B
thicker in middle

C
converges rays at a point

D
all of the above

Solution

Answer is D.

A convex lens is a converging lens. When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.
A convex lens is thicker at the centre than at the edges.
Hence, all the options are right.
Question 8
1 / -0

Which of the following term is not associated with a lens?

A
Aperture

B
Focal length

C
Principal focus

D
Momentum

Solution

The term momentum is not associated with a lens. It is the product of mass and velocity of a body.
Question 9
1 / -0

A ray of light incident on glass finally emerges out of it. The ray which emerges out is called :

A
incident ray

B
refracted ray

C
emergent ray

D
none of these

Solution

A ray of light incident on glass finally emerges out of it. The ray which emerges out is called emergent ray.
Question 10
1 / -0

A beam of light incident on a convex lens parallel to its principal axis converges at a point on the principal axis. Name the point :

A
First focus

B
Second focus

C
First centre

D
Second centre

Solution

Second principal focus is the point where rays travelling parallel to principal axis meet after they pass through the convex lens.

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Light Reflection and Refraction Test - 26

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Light Reflection and Refraction Test - 26

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Question 1

bends away from the normal

bends towards the normal

goes undeviated

is reflected back

Solution

Question 2

Convex only

Concave only

It may be convex or conacve

None of these

Solution

Question 3

metre

Dioptre

Watt

Horse power

Solution

Question 4

$$0^{\circ}$$

$$45^{\circ}$$

$$90^{\circ}$$

$$180^{\circ}$$

Solution

Question 5

reflected

deviates

normally

less

Solution

Question 6

Incident

refracted

reflected

All the above

Solution

Question 7

tapering at edges

thicker in middle

converges rays at a point

all of the above

Solution

Question 8

Aperture

Focal length

Principal focus

Momentum

Solution

Question 9

incident ray

refracted ray

emergent ray

none of these

Solution

Question 10

First focus

Second focus

First centre

Second centre

Solution

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