In message <kkh7vu+igoh@...>, dated Mon, 15 Apr 2013, sawreyrw <sawreyrw@...> writes:
This is true only at low frequcncies, and that's the reason the OP wants to know the effect as a function of frequency.
Well, it's sufficiently true up to some frequency (depending on the definition of 'sufficiently'), but of course it doesn't apply from DC to light.
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