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A monochromatic ray of light is refracte...

A monochromatic ray of light is refracted from vacuum to a medium of refractive index `mu`. Determine the relation of the wavelengths of light in vacuum and in medium.

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`mu = (c)/(v) = (nlambda_(0))/(nlambda) = (lambda_(0))/(lambda)`
`so, " " lambda_(0) = mu lambda`
[Here, c and v are the velocities of light in vacuum medium respectively, n = frequency of light, which unchanged on refraction, `lambda_(o) , lambda` = wavelength in vacuum in the medium respectively. ]
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