Question

23. The ratio of velocity of light in a
medium to the velocity of light in
vacuum gives refractive index of
that medium.​

Answer 1

Refractive index of glass is 1.52. Note: The velocity of light in vacuum is a universal constant, but it may change if light propagates in any medium other than vacuum. As light moves from one material or medium to another, the velocity of light increases or decreases according to the density of the medium.

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