Question

A ray of light strikes a glass prism at angle of 90° to the surface of prism.

1. What is the angle of incidence?
2. What is the angle of refraction?
3. Will the ray suffer refraction?

Answer 1

The ray strikes the surface at 90° to the surface, so it travels along the normal.

1. Angle of incidence = 0°.
2. Angle of refraction = 0°.
3. The ray passes straight through without bending or changing direction. Thus, it suffers no deviation.