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Define refractive index of a medium....

Define refractive index of a medium.

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Refractive index of a transparent medium is defined as the ratio of speed of light in vacuum (or air) to the speed of light in that medium.
refractive index n of a medium ` = (" speed of light in vacuum (c) ")/(" speed of light in medium (v) ")`
`n = c/v `
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