NDA 2018 Physics question

The refractive indices of two media are denoted by and , and the velocities of light in these two media are respectively and . If is 1·5, which one of the following statements is correct?

(A) is 1·5 times .Correct
(B) is 1·5 times .
(C) is equal to .
(D) is 3 times .

Answer: (A)

Solution

, so the velocity is inversely proportional to the refractive index:

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Question ID VK-031204