Question

what happend?if we roated the incident ray in roating plane mirror?

Answer 1

Answer:

Thus, for a fixed incident ray, the reflection angle is twice the angle through which the mirror has rotated. When a plane mirror is rotated at an angle θ, the reflected ray rotates through the angle 2θ. However, the size of the image remains unchanged only position shifts.

Answer 2

Answer:

For a fixed incident light ray, if the mirror be rotated through and angle theta (about an axis which lies in the plane of mirror and perpendicular to the plane of incidence), show that the reflected ray turns through an angle 2theta in same sense.