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## Main Question or Discussion Point

The index of refraction is a complex number if the mediums conductivity is non zero.

n=Re(n)+Im(n)*i

We know that for real refractive index:

v=c/n

How is the corresponding relation for complex n? I would expect (and got from my calculations)

v=c/Re(n),

but since Re(n) may become arbitarilly small (by chosing the frequency of the wave suitably) I distrust the above.

n=Re(n)+Im(n)*i

We know that for real refractive index:

v=c/n

How is the corresponding relation for complex n? I would expect (and got from my calculations)

v=c/Re(n),

but since Re(n) may become arbitarilly small (by chosing the frequency of the wave suitably) I distrust the above.