the ratio of speed of light in vacuum to speed of light in given media.

that is... refractive index(n)=  speed of light in vacuum(c)/speed of light in given media (v)

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Refractive index is the ratio of the sine of angle of incidence and the sine of angle of refraction.
It is also defined as the ratio of speed of light in air/vacuum and speed of light in a medium.
It is represented by the letter "μ".

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refractive index is the ratio between the speed of light in vaccum tothe speed of light in a given medium