The problem gives the angular frequency of a light wave (w) is represented by(adsbygoogle = window.adsbygoogle || []).push({});

e^iw(t-nx/c)

it says that sometimes n is replaced by the complex quantity n-ik.

The question asks what is the effect of k on the wave. Also, it asks, what is its physical signifigance?

I tried substituting in for n-ik for n, and then multiplying in the iw.

I got: e^ (iwt-iwnx +kx)/c

So I see that the k term is the only real term in the exponent, however I am not sure how that effects the wave, or what its physical signifigance is.

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# Homework Help: Light wave

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