Question

Que. (A) The refractive index of glass is 1.5. What is the speed of light in glass? ( speed of light in vacuum is $3.0\times {10}^{8}m{s}^{-1})$
(B) Is the speed of light in glass independent to the colour of light? Which of the two Colour red and violet travels slower in glass prism?

Answer 1

The relation between redfractive index and speed is as follows

$n=\frac{c}{v}$ where c is the velocity of light and v is the velocity of light in glass.

So,

$1.5=\frac{3\times {10}^8}{v}$

$v=2\times {10}^{8}m/s$