Wavelength of light moving in vacuum is .
Refractive Index of Diamond is .
Let, frequency of light is and wavelength of light in Diamond is .
Since, refractive index is the ratio of speed of light in vacuum to the speed of light in any other medium,we get
But we also know that frequency of light is independent of medium i.e frequency of light doesn't change, thus
Hence, from the above formula we get,
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Wonderful explanation!
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