Question

What is total internal reflection?

Answer 1

The complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle is known as total internal reflection.

Answer 2

The reflection of light at the interface separating denser and rarer medium is called total internal reflection...
Conditions:-
1) Light should travel from denser to rarer medium
2) angle of incidence should be greater than critical angle i>C
It occur after r bcms 90 degree