A ray of light in air enters a glass surface at right angles to the surface. What is the angle of incidence?

Question

Quizplus · Accepted Answer

When a ray of light enters a glass surface at right angles to the surface, the angle of incidence is 0°. This is because the angle of incidence is defined as the angle between the incident ray and the normal to the surface at the point of incidence, and when the ray is perpendicular to the surface, the angle between the ray and the normal is 0°.

A Ray of Light in Air Enters a Glass Surface