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# Speed of light is maximum in

(a) water

(b) air

(c)glass

(d)diamond

Can you answer this question?

Speed of light is medium is inversely proportional to the refractive index of medium.
$v \;\alpha \;\large\frac{1}{\mu}$
$\mu$ of air is least
$\therefore$ v in air is maximum
Hence b is the correct answer.

answered Jan 21, 2014 by
edited Jul 15, 2014