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Light of wavelength 1000 nm in air enters a medium of refractive index 1.5 If the frequency of the light remains unchanged find speed and wavelength in

that medium


Refractive index of a medium is defined as the ratio of speed of light in vacuum to speed of light in the medium.

Let velocity in vacuum = v
refractive index of glass is 3/2. 
(you have given wrong information.)

So speed of light in vacuum is .

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