Define absolute refractive index. - Vidyadip

Question

Define absolute refractive index.

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Answer

The absolute refractive index of a medium is defined as the ratio of the magnitude of the velocity of light in vacuum to the magnitude of the velocity of light in the medium.
[Note: The speed of light is maximum in vacuum, about $3 \times 10^8 m / s$. When light travels from one medium to another, there occurs a change in its speed and wavelength (A). But its frequency (v) remain the same.]

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