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2
questions
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Is $n=\sqrt{\mu_r\varepsilon_r}$ always true? even with complex value?
I have trouble deriving a supposedly "well-known" equation used in condensed matter physics:
$$n^2=\mu_r\varepsilon_r+\frac{i\mu_r\sigma}{\varepsilon_r\omega}$$
I'm sure that $n$ and $\sigma$...
- 213
1
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4
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About the lowering of the speed of light in non-vacua
I don't understand really why matter interacts with light so as to slow down wavefronts to a speed strictly below $c$, but still preserving that sharp wavefront-like signal.
This is somewhat ...
- 643