Question

Question 5
A light ray enters from medium A to medium B as shown in 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 1

(a) greater than unity

Since the ray is moving towards the normal when it enters medium B from medium A, medium B is denser than medium A. Hence, the ratio $\frac{n_b}{n_a}$ is greater than 1.