Question

The angle of incidence is the angle between the incident ray and the line _____ to the surface.

Answer 1

In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal.

Step-by-step explanation:

Answer 2

Perpendicular

Step-by-step explanation:

i = angle of incidence

r = angle of reflection