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. (a) `v(A)gtv(B)` and `n(A)gtn(B)`
B. (b) `v(A)gtv(B)` and `n(A)ltn(B)`
C. (c) `v(A) lt v(B)` and `n(A)gtn(B)`
D. (d) `v(A) lt v(B)` and `n(A) lt n(B)`

Answer

B

Explanation

Light travels faster in rarer medium. This alone decides is favour of option (b).