Question

If the velocity of light in vaccum is'c', and the absolute refractive index of glass is 1.5, what will be the velocity of light in glass?
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Answer 1

299792458 meter per second

Answer 2

let the Velocity of light in vacuum be 'c'

Given: refractive index of glass = 1.5

Refractive index, n = $\rm\frac{speed\:of\:light\:in\:air, \: c}{speed\:of\:light\:in\:glass,\: g}$

=> 1.5 = $\rm\frac{3 × 10^8}{g}$

=> g = $\rm\frac{3 × 10^8}{1.5}$

=> g = 2 × 10^8 m/s

Velocity of light in glass, g = 2 × 10^8 m/s