Question -
Answer -
(a) Refractiveindex of glass, μ = 1.5
Speed oflight, c = 3 × 108 m/s
Speed oflight in glass is given by the relation,
Hence, the speed of light inglass is 2 × 108 m/s.
(b) The speed of light in glass isnot independent of the colour of light.
Therefractive index of a violet component of white light is greater than therefractive index of a red component. Hence, the speed of violet light is lessthan the speed of red light in glass. Hence, violet light travels slower thanred light in a glass prism.