Question

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 I have been asked this question in an online interview. This is a very interesting question from Refractive Index and Numerical Aperture in division EM Wave Propagation of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

Correct option is (d) 2 Easiest 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.