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Statement of a problem № 3971

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Show that for light waves of angular frequency w in a medium of refractive index n, the group velocity vg and the phase velocity vp are related by the expression 1/vg=1/vp + w/c dn/dw where c is the velocity of light in free space.

Solution:
Show that for light waves of angular frequency w in a medium of refractive index

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