Question

What is the deviation suffered by light after reflecting
from a plane mirror, having angle of incidence i?
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Answer 1

Answer:

Deviation of Light by a Plane-Mirror

A ray of light that is incident on to the surface of a plane-mirror is reflected with the angle of incidence equal to the angle of reflection. ... The deviation of a mirror is equal to twice the angle of incidence.

Explanation:

The angle of deviation of a It is basically the angle through which the light ray has deviated from its original path due to reflection. Since OA' is just an extension to the incident ray path AO, ∠AOA' = 180°. As stated in the problem, the light ray is incident on a plane mirror at an angle of 40° with respect to the surface normal.light ray reflected by a plane mirror is 150^(@).