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Q.

A ray of light strikes a glass slab at an angle of $9 0^{°}$ . The angle of incidence is

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a

9 0^{°}

b

0^{°}

c

45^{°}

d

None of these

answer is B.

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Detailed Solution

A ray of light strikes a glass slab at an angle of

9 {0 °}^{}

. The angle of incidence is

{0 °}^{} .

It is given that the incident ray falls perpendicular or vertically on a glass slab. The angle between the incident ray and the normal becomes zero on the surface of the glass slab. Thus, the ray comes vertically and goes back the same way. Because of this, angles of incidence become zero. When a light ray strikes the glass surface perpendicularly or at a

90 °

angle to the surface, it will pass through without altering direction. The angle of incidence is always zero.
Explanation for the incorrect option(s):

1) 90 °

There is no change in the direction of the light ray.

3) {45 °}^{}

Due to no change in direction, the angle of incidence cannot have a positive measure.

4)

none of these
The angle of incidence, in this case, will be zero.
So, when a ray of light strikes a glass slab at

90 °

, the angle of incidence is zero.

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