A light ray strikes a plane mirror at an angle of 20 degrees to the normal. What is the angle of the reflected light ray to the normal?

40 degrees

70 degrees

0 degrees

20 degrees

Answer: 20 degrees

Explanation:

According to the Law of Reflection, when a ray of light strikes a surface, the angle of this ray (incident ray) with respect to the normal of the surface is equal to the angle that forms the reflected ray with the same normal of the surface.

In other words:

Both the incident ray and the reflected ray and the normal to the surface are in the same plane, in addition, the angle of the incident ray is equal to the angle of the reflected ray.

In this context, when a ray strikes the surface of a plane mirror, both the incident angle and the reflected angle will be the same.