Lag1989 task 22.38

Lag1989 task 22.38

The phase velocity V of light in a certain medium: a) changes with the frequency of light ω according to the law V=αωq; b ) changes with the wavelength λ in a given medium according to the law V=βλᵖ ( q and p are numbers less than 1, α and β are constants ). Find the group velocity U.

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