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)`. If `v(A)` and `v(B)` are the speeds of light in A and B respectively. Then which of the following is true?

Options

A. `v(A) gt v(B)` and `n(A) gt n(B)`
B. `v(A) gt v(B)` and `n(A) lt n(B)`
C. `v(A) lt v(B)` and `n(A) gt n(B)`
D. `v(A) lt v(B)` and `n(A) lt n(B)`

Answer

B

Explanation

`:. /_igt/_r`, it mean light ray is going from rarer medium `(A)` to denser medium.
So `v(A)gtv(B)` and `n(A)gtn(B)`