A light ray enters from medium A to medium B as shown in the Figure. The refractive
A light ray enters from medium A to medium B as shown in the Figure. The refractive

index of medium B relative to A will be

(a) greater than unity

(b) less than unity

(c) equal to unity

(d) zero

Answer: (a) greater than unity

Explanation: The refractive index is the bending of a light ray when it passes from one medium to another. So, n>1. The refractive index of medium B relative to medium A is greater than unity.