What is the absolute refractive index?

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Ratio of speed of light in rarer medium to that of denser medium

Ratio of speed of light in air to speed of light in medium

Ratio of speed of light in air to speed of light in vacuum

Ratio of speed of light in vacuum to speed of light in medium

answer is D.

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Detailed Solution

"The absolute refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium."
The ratio of the speed of light travelling from one medium to another medium gives the refractive index of the second medium relative to the first medium. “The refractive index is the measure of the bending of a light ray while passing from one medium to another.” And can be formulated as
Refractive Index of the medium,

µ_{m} = \frac{Speed of light in vacuum}{Speed of light in medium}

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