Question

Explain total internal reflection. state the conditions.

Answer 1

the effect that occurs when light meets the interface between the medium in which it is traveling and a medium

of smaller refractive index at an angle of incidence greater than the critical angle, all light being reflected back

to the first medium.

For total internal reflection to occur, 2 conditions must be met: 1. The index of refraction must decrease

across the boundary in the direction of light refraction. 2. The angle of incidence of the light ray

must exceed the critical angle of the interface.