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# Light travels ___________(Faster, slower) in air, but_________ (Faster, slower) in glass.A. Faster, faster respectivelyB. Slower, faster respectivelyC. Faster, slower respectivelyD. None Verified
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Hint:An optically denser medium is the one that eventually slows down or reduces the velocity of the incident wave when the incident wave falls on that medium whereas an optically rarer medium is one that speeds up or eventually causes the wave to pass through it faster than in the medium it was previously in. Using this information, we can find out the correct answer.

As we know, $v$ is equal to the speed of light in any medium. $c$ is equal to the speed of light in the vacuum. $\mu$ is equal to the permeability of the medium. The relation between the above 3 constants is given by –
$v = \dfrac{c}{\mu }$
Value of $c$ is constant that is $3 \times {10^8}m/s$ thus $v \propto \dfrac{1}{\mu }$