A train of plane light waves propagates in the medium where the phase velocity v is a

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A train of plane light waves propagates in the medium where the phase velocity v is a linear function of wavelength: v = bλ, where a and b are some positive constants. Demonstrate that in such a medium the shape of an arbitrary train of light waves is restored after the time interval τ = 1/b.
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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