Question

What is a critical angle?

Answer 1

The critical angle is an angle at which light changes its behavior when traveling from one material to another. If the angle of incidence is larger than the critical angle, the light will not bend but instead be completely reflected back into the original material, which is called total internal reflection.

Answer 2

Answer: When light travels from a denser to a rarer medium, the angle of incidence, whose angle of refraction is 90 degrees, is called the critical angle.