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A wavelength of a monochromatic light in...

A wavelength of a monochromatic light in vacuum is `lambda` . It travels from vacuum to a medium of absolute refractive index `mu`. The ratio of wavelength of the incident and refracted wave is

A

`mu^2 : 1`

B

`1:1`

C

`mu : 1`

D

`1: mu`

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