Question

Refractive index in physics and Relative refractive index

Answer 1

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Answer:

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The Absolute Refractive Index of an optical medium is defined as the ratio of the speed of light in vacuum to the speed of light in that medium. It is numerically also equal to the ratio of the sine of the angle of incidence in vacuum, to the sine of the angle of refraction in that medium...

The Relative Refractive Index of a second medium with respect to a corresponding first medium is defined as the ratio of the speed of light in the first medium, to the speed of light in the second medium...

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Answer 2

Answer:

The refractive index n of an optical medium is defined as the ratio of the speed of light in vacuum, c = 299792458 m/s, and the phase velocity v of light in the medium,[1]

{\displaystyle n={\frac {c}{v}}.}n={\frac {c}{v}}.

The phase velocity is the speed at which the crests or the phase of the wave moves, which may be different from the group velocity, the speed at which the pulse of light or the envelope of the wave moves.

The definition above is sometimes referred to as the absolute refractive index or the absolute index of refraction to distinguish it from definitions where the speed of light in other reference media than vacuum is used.[1] Historically air at a standardized pressure and temperature has been common as a reference medium.

Explanation:

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