Explain the propagation of a ray of light, when a ray is incident normal to the interface between any two media.

Ans. 1. A special effect is observed when the ray is incident normal to the interface between any two media in any way i.e. either from rarer to denser or denser to rarer medium.

2. Here the angle of incidence is zero, hence ray of light propagates undeviated from one medium to another.