A reflected ray of light leaves a plane mirror's surface at an angle of 60° relative to the normal. The angle of incidence was
A) 60° relative to the surface.
B) 60° relative to the normal.
C) 90° from the surface.
D) none of these.

Question

Quizplus · Accepted Answer

The angle of incidence equals the angle of reflection. Since the reflected ray leaves at 60° relative to the normal, the incident ray also approached at 60° relative to the normal.

A Reflected Ray of Light Leaves a Plane Mirror's Surface