Question

Two plane mirrors are inclined at an angle of 75º. A ray of light is incident on one of the mirrors.
The ray undergo total deviation of
​

Answer 1

Answer:

◆ Answer -

Total deviation of light ray = 140°

● Explanation -

Given that 2 plane mirrors are inclined at an angle75 degree. Suppose a ray of light is incident on 1st mirror at angle i. Hence, deviation at 1st mirror is 2i. Now this ray will incide on 2nd mirror at angle75-i. So deviation at 2nd mirror is 2(75-i) = 140-2i. Hence, total deviation of light ray will be 2i + 140-02i = 140°.

Thanks dear. Hope this helps you..

Answer 2

Answer:

210°

Explanation:

net divination=360°-2(measure of inclined angle)

=360-150

=210

the person above who claims the answer to be 140 has misunderstood the question, the inclination is of 75° and we are supposed to find the net diviation