Question

A ray of light makes an angle of 50° with the surface S1 of the glass slab. Its angle of incidence will ____ a.50° b.40° c.140° d.0°

Answer 1

the answer is 40 because angle of incidence is the angle made by incident day on normal or 90-50 which is 40

Answer 2

Answer:

(b). The incidence angle will be 40° .

Explanation:

Given that,

A ray of light makes an angle of 50° with the surface S of the glass slab.

We know that,

Incidence angle: The incidence angle is the angle between the incidence ray and normal line.

According to figure,

The light ray makes an angle of 50° with the surface.

Then,

The incidence angle will be 40° .

Hence, The incidence angle will be 40° .