Question

(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 x 10⁸ ms^-1)
(b) Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?

Answer 1

(a) μ = 1.5

C = 3 x 10⁸ ms^-1

(b) The speed of light in glass is not independent of the colour (wavelength) of light of the two, violet light travels slower in a glass prism.