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Q.

The ____ index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in that medium.

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Detailed Solution

The refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in that medium.
The refractive index is a dimensionless quantity. It is an index that indicates the number of times slower a light wave would be travelling in the material than that is in a vacuum. "The refractive index, represented by symbol n, is the ratio of the velocity of light in vacuum (c) divided by the velocity of light in a medium (v)." Mathematically,

n = \frac{c}{v}

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