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# Speed of light is maximum in

(a) water

(b) air

(c)glass

(d)diamond

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.

edited Jul 15, 2014