Question

Explain the bending of a ray of light when it travels from a rarer to a denser medium.

Answer 1

When a ray of light travels from an optically rarer medium (e.g., air) to an optically denser medium (e.g., glass), its speed decreases, and it bends towards the normal at the point of incidence. Here, the angle of incidence (i) is greater than the angle of refraction (r), i.e., i > r.