Refractive indices of four media A, B, C and D are given below:
In which of these four media is the speed of light (i) maximum, and (ii) minimum?
The refractive index of a medium is related to the speed of light as follows:
Refractive index =`"speed of light in vacuum "/"speed of light in a medium"`
Since the speed of light in vacuum is a constant, the refractive index becomes inversely proportional to the speed of light in a medium.
(1)The speed of light is maximum in a medium that has the lowest refractive index, ie., medium A
(2) The speed of light is minimum in a medium that has the highest refractive index, ie., medium D.