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Prateek Asked :

25-09-2021 Electromagnetic Theory

Q. Find the refractive index of a medium having a velocity of 1.5 x 10^8.

A. 0.5
B. 5
C. 0.2
D. 2

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Dapzoi Verified
Commented on 2021-09-25 11:06:21 (IST)
Answer: D

Explanation: The refractive index is given by the ratio of the speed of light to the velocity in a particular medium. It is given by n = c/v. On substituting for v = 1.5 x 10^8 and c = 3 x 10^8, we get n = 3/1.5 = 2. The quantity has no unit.