Which of the following is the correct relation between the group velocity and the phase velocity? a) vg = vp + λdvp/dλ b) vp = vg + λdvp/dλ c) vp = vg – λdvp/dλ d) vg = vp – λdvp/dλ
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Which of the following is the correct relation between the group velocity and the phase velocity?
a) vg = vp + λdvp/dλ
b) vp = vg + λdvp/dλ
c) vp = vg – λdvp/dλ
d) vg = vp – λdvp/dλ
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