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Statement of a problem № 3972

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Prove that the usual expression for the group velocity of a light wave in a medium can be rearranged as vg = c dv/d(nv), where c is the phase velocity of the waves in free space, v is the frequency and n is the refractive index of the medium.

Solution:
Prove that the usual expression for the group velocity of a light wave in a medi

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