Fewpal
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How is the refractive index of a medium related to the speed of light? Obtain an expression for a refractive index of a medium with respect to another in terms of speed of light in these two media?

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Refractive Index can be seen as the factor by which the speed and the wavelength of the radiation are reduced with respect to their vacuum values. 

w = cnv (where n:refractive index,c=speed of light,v:velocity of light in that medium)

Refractive index of one medium in relation to a second medium is given by ratio of speed of light In second medium to speed of light in first medium.

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