Question

explain the critical angle and total internal reflection and vitality in different medium​

Answer 1

The Critical Angle is the incidence angle at which the angle of refraction is 90 degrees (90°).

The phenomenon of total internal reflection occurs when all incident light is reflected off the boundary. It can only happen if both of the following requirements are met:

• A light beam is in the denser medium and approaching the denser media.

• The light ray's angle of incidence is larger than the so-called critical angle.