Question

A ray of light is incident normally on a plane glass slab. What will be the angle of refraction ?

• A. ${90}^o$
• B. ${180}^o$
• C. ${60}^o$
• D. $0^o$

Answer 1

The correct option is D $0^o$

We are given in the question that the incident ray is perpendicular to the surface and hence it does not make any angle with the normal or the angle of incidence $\angle i=0$ and hence $\angle r=0$ is also zero by applying the laws of refraction.