Question

If the velocity of light in vacuum is 3 x 10^8 ms-1 and in another medium M is 0.75 x 10^8 ms -1, what is the refractive index of M?​

Answer 1

We knkw the formula;

$\implies \rm \mu =\dfrac{c}{v}$

where $\mu = Refractive\: index$

v = speed of light in another medium, c = spped of light in vaccum.

$\to\rm \mu = \dfrac{3\times 10^8}{0.75\times 10^8}$

$\to\rm \mu = \dfrac{3}{0.75}= \dfrac{300}{75}$

$\to\bf \mu = 4$

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Answer 2

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refer to the attachment !