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Complex index of refraction

Hi

When we have a complex index of refraction, the real part determines the phase-change of the incoming wave and the complex part attenuates the wave. When we e.g. want to find the phase velocity using v = c/n, when should we use the real part of n or the modulus of n?

Best,
Niles.  

    Hence a monochromatic wave would be .So points of constant phase are determined by Re(n)x/c-t=const which move with the speed c/Re(n).  

    I see, thanks!
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