Absolute refractive indices of some of the materials A, B, C, and D are given in the following table:

In which of the following materials given in the above table does the light travel fastest?

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answer is B.

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Detailed Solution

In material B, the light travels fastest.
We know that the refractive index is inversely proportional to velocity in that medium as

v α \frac{1}{μ}

So among the given mediums, B has the least refractive index, which indicates that B is much optically rarer than other given mediums, hence light will travel faster in medium B.

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