Total internal reflection is defined as the light ray reaching an interface with a less dense medium such that the angle of incidence is more than the critical angle.
Total internal reflection occurs when the angle of incidence is greater than the critical angle.
Total internal reflection takes place when the light rays move from the given medium with a refractive index into a medium having a lesser refractive index.
Following are the two conditions for total internal reflection to take place:
- The light ray must travel from a denser medium to less dense medium.
- The angle of incidence must be greater than the critical angle.