Question

relation between critical angle of water and glass prove it

Answer 1

the phenomenon of total internal reflection was introduced. Total internal reflection (TIR) is the phenomenon that involves the reflection of all the incident light off the boundary. TIR only takes place when both of the following two conditions are met:

a light ray is in the more dense medium and approaching the less dense medium.

the angle of incidence for the light ray is greater than the so-called critical angle.