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 ?

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v(A) > v(B) and n(A) > n(B)

v(A) > v(B) and n(A) < n(B)

v(A) < v(B) and n(A) > n(B)

v(A) < v(B) and n(A) < n(B)

answer is B.

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Detailed Solution

Light travels faster in rarer medium. This alone decides is favour of option (2).

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