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Asked by | 14 Sep, 2008, 12:51: PM
answered-by-expert Expert Answer

The refractive index  of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. For example, typical glass has a refractive index of 1.5, which means that in glass, light travels at 1 / 1.5 = 0.67 times the speed of light in a vacuum

The refractive index n of a medium is defined as the ratio of the phase velocity c of a wave phenomenon such as light  in a reference medium to the phase velocity vp in the medium itself:

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Answered by | 15 Sep, 2008, 07:27: AM

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