Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 51

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Question 1
1 / -0

The incident ray, the normal at the point of incidence and the refracted ray:

A
lie on mutually orthogonal planes

B
lie on mutually parallel planes

C
lie on the same plane

D
lie on different arbitrary planes

Solution

The incident ray, the normal at the point of incidence and the refracted ray, all lie in the same plane. This is according to the law of refraction.
Question 2
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The cut part of sphere is coated outside with silver or similar material. What kind of mirror does it form?

A
Convex mirror

B
Concave mirror

C
Plane mirror

D
None

Solution

Coating a sphere from outside forms a concave mirror while coating it from inside forms a convex mirror.
Question 3
1 / -0

Fill in the blank:

Focal length ($$f$$) is the distance of principal focus from ______ of mirror.

A
Centre of curvature

B
Focus principal (F)

C
Pole (P)

D
None

Solution

Focal length $$f$$ is the distance of principal focus from the pole of mirror.
Question 4
1 / -0

When a ray of light passes through the rectangular glass slab, the angle of deviation is

A
equal to $$0$$

B
an acute angle

C
an obtuse angle

D
equal to $$\dfrac{\pi}{2}$$

Solution

When a ray of light passes through a rectangular glass slab, the emergent ray is parallel to the incident ray produced.
Now, angle of deviation is the angle between the emergent ray and the incident ray produced.
So, these two rays being parallel, the angle of deviation is $$0$$.
Question 5
1 / -0

When a ray of light passes through a rectangular glass slab:

A
After the first refraction, it bends towards the normal and after the second refraction it bends away from the normal

B
After the first refraction, it bends away from the normal and after the second refraction it bends towards the normal

C
After both refractions, it bends towards the normal

D
After both refractions, it bends away from the normal

Solution

A light ray travelling obliquely from a denser medium to a rarer medium bends away from the normal. A light ray bends towards the normal when it travels obliquely from a rarer to a denser medium. Glass is denser than air,
Therefore, When a ray of light passes through a rectangular glass slab, after the first refraction, it bends towards the normal and after the second refraction, it bends away from the normal.
Question 6
1 / -0

Fill in the blanks:
________ is geometric centre of spherical mirror.

A
Principal force (F)

B
Centre of curvature (C)

C
Pole (P)

D
Secondary focus $$(F_2)$$

Solution

The geometric centre of a spherical mirror is called Centre of curvature (C). It is the center of a hollow spherical surface from which this mirror is taken off.
Question 7
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What is the difference between concave and convex mirrors? Choose the correct statement ?

A
Convex mirror is curved outwards and concave mirror is curved inwards

B
Focal point is in front of convex mirror and for a concave mirror, it is behind

C
Centre of curvature is in front of convex mirror and for a concave mirror, it is behind

D
None of these

Solution

Part of the hollow glass sphere is cut and coated outward and inwards respectively to form concave and convex mirrors.
Question 8
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A ray of light passes through a glass slab and the angle of emergence is found to be smaller than the angle of incidence. So, we may conclude that the glass slab

A
Is rectangular in shape

B
Is square in shape

C
Is not rectangular or square in shape

D
May or may not be rectangular in shape

Solution

For a rectangular glass slab, the angle of emergence for a ray of light is equal to the angle of incidence. These angles will not be equal when the sides of the glass slab are not parallel.
Question 9
1 / -0

A man focused an inverted image formed by a lens. It can be:

A
Convex lens

B
Concave lens

C
Convex or concave lens

D
Plane mirror

Solution

Among convex and concave lens, only convex lens can form inverted images.
Question 10
1 / -0

Principal axis is the line joining the pole and the:

A
Principal line

B
Centre of curvature

C
Mirror

D
None of these

Solution

A straight line passing through the pole and the center of curvature of a spherical mirror is called the principal axis.