15. Refractive index of a medium can be defined as
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The absolute refractive index of a medium is defined as the ratio of the speed of light in vacuum (or air) to the speed of light in that medium i.e., n=vc. Refraction is the measure of the bending of a ray of light when passing from one medium into another.
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the ratio of the speed of light in one medium to the speed of light in a given medium is known as the refractive index.
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