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The ratio of the speed of light in a medium to the speed of light in a vacuum is called |
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Answer» Thespeed of lightin a given material is related to a quantitycalledthe index of refraction, n, which is defined as theratioof thespeed of lightinvacuumto thespeed of lightin themedium: index of refraction : n = c / v. Whenlighttravels from onemediumto another, thespeedchanges, as does the wavelength. Ratio of speed of light in vacuum to the speed of light in medium is called the Refractive index of that medium |
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