Refractive indices of water, sulphuric acid, glass and carbon disulphide are 1.33, 1.43, 1.53 and 1.63 respectively. The light travels slowest in:(a) sulphuric acid (b) glass (c) water (d) carbon disulphide
(d) carbon disulphide
Explanation
The refractive index of a medium is related to the speed of light as follows:
$Refractive\ index\ of\ a\ medium=\frac {Speed\ of\ light\ in\ vacuum}{Speed\ of\ light\ in\ medium}$
Since the speed of light in vacuum is constant, the refractive index becomes inversely proportional to the speed of light in a medium (if the speed of light in a medium increases then the value of the refractive index decreases and vice-versa).
Thus, the light will travel slowest in carbon disulphide, as it has the maximum refractive index of 1.63.
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