1.

Define refractive index of a transparent medium. The speed of light in amedium of absolute refractive index 1-5 is 2 x 108 ms-1. What is thespeed of light in vacuum ?

Answer»

Refractive index of a transparent medium is defined the ratio of speed of light in vacuum and speed of light in medium.

Is given by : n = c/v

Where, n is the refractive index.c is the speed of light in vacuum.v is the speed of light in medium.-------------

It has no units. Because it is the ratio of quantities which are similar.



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