What is refractive index of a medium?

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medium in which light travel with high speed

A medium in which light travel with low speed

A medium in which light travel with variable speed, but the speed will depend on medium to medium

None of these

answer is C.

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Detailed Solution

A medium in which light travel with variable speed, but the speed will depend on medium to medium.
The refractive index of a medium is defined as the ratio of the speed of light in vacuum to the speed of light in the medium. It's a dimensionless quantity that describes how light moves through a medium. The refractive index is a measurement of how much a light ray bends when it passes from one medium to another.

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