Question

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?

• 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 $n(A) < n(B)$

Answer 1

Answer: (B)

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