Question

what is
normal
to
the
point of incidence?​

Answer 1

At the point of incidence where the ray strikes the mirror, a line can be drawn perpendicular to the surface of the mirror. This line is known as a normal line (labeled N in the diagram). The normal line divides the angle between the incident ray and the reflected ray into two equal angles.

Answer 2

Answer:

Normal incidence means that an incident ray strikes a surface perpendicularly, that is, along the normal to the surface at the point of incidence. For normal incidence, the angle of incidence, i=0.