Question

A ray of light is incident on a plane mirror at an angle of incidence of 30°. The deviation produced by
the mirror isA. 30°
B. 60°
C. 90°
D. 120°

Answer 1

Explanation:

the answer is 120

I hope you understand my solution by above pic

Answer 2

Answer:

120

Explanation:

if the mirror was not there, the ray of light would have gone straight, but since the mirror is present there it will follow the law of reflection and will be reflected back at the angle of incidence.

deviation will be = 180 -(angle of incidence + angle of reflection)