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> It's more that, in everyday life, there is no way of turning light into
> either electricity
Solar panels.
> So that's the magic relationship? Those two measurements allow you to
> determine the index of refraction?
Yes, but bear in mind those two properties will likely not be constant over
frequency (maybe one of them will be, I don't know).
> Presumably knowing the *colour* of an object still requires you to compute
> electron energy band gaps and weird crap like that though?
Probably, I don't know the details, I just know that for eg car paint there
is *a lot* of this sort of research to get colour pigments that don't fade
or change colour after 20 years in the sun. You certainly need to know your
chemistry and physics!
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