Question

the ________at the point of incidence is called normal

Answer 1

perpendicular imaginary line to the principal axis

Answer 2

Answer:

The line perpendicular to the surface at the point of incidence and reflecting surface is called  normal.

Explanation:

• Normal is the line drawn perpendicular to the reflecting surface at the point of incidence.
• The angle between the incident ray and the normal is known as the angle of incidence.
• The angle between the reflected ray and the normal is known as the angle of reflection.