Q. A beam of light propagating in medium $A$ with index of refraction $n\ (A)$ passes across an interface into medium $B$ with index of refraction $n(B)$. The angle of incidence is greater than the angle of refraction; $v(A)$ and $v(B)$ denote the speed of light in $A$ and $B$. Then which of the following is true
A) $v(A) > v(B)$ and $n(A) > n(B)$
B) $v(A) > v(B)$ and $n(A) < n(B)$
C) $v(A) < v(B)$ and $n(A) > n(B)$
D) $v(A) < v(B)$ and $n(A) < n(B)$
Explanation
(b) $\because\angle i > \angle r,$ it means light ray is going from rarer medium $(A)$ to denser medium
So $v(A) > v(B)$ and $n(A) < n(B)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.