A beam of light propagating at an angle ...

A beam of light propagating at an angle `alpha_(1)` from a medium 1 to another medium 2 at an angle `alpha_(2)`. If the wavelength of light in medium 1 is `lambda_(1)`. The wavelength of light in medium 2, `(lambda_(2)`, is

`(sinalpha_(2))/(sinalpha_(1))lambda_(1)`

`(sinalpha_(1))/(sinalpha_(2))lambda_(1)`

`((alpha_(1))/(alpha_(2)))lambda_(1)`

`lambda_(1)`

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