An incident ray of light makes an angle of 25° with the normal to a plane mirror. If the mirror is rotated through an angle of 7°, keeping the direction of the incident ray fixed, the reflected ray will be rotated by an angle of:

A light ray incident on a plane mirror makes an angle of 30° with the mirror surface. What is the angle made by the reflected ray with the normal?

After refraction of a plane wave incident on a rarer medium, the wave front / ray ______.

What does the acronym LASER stand for in the context of light technology?