Question

Why is refractive index in a transparent medium greater than
one ?
(a) Because the speed of light in vaccum is always less
than speed in a transparent medium
(b) Because the speed of light in vaccum is always greater
than speed in a transparent medium
(c) Frequency of wave changes when it crosses medium
(d) None of these

Answer 1

Answer:

CORRECT OPTION IS (B)

Here refractive index of medium is inversely proportional to speed of light in the medium. As refractive index of vacuum is 1, speed of light is always greater in vacuum as compared to transparent medium. Hence, refractive index of transparent medium is always greater than one.

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