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>> It's more that, in everyday life, there is no way of turning light
>> into either electricity
>
> Solar panels.
And when do you *ever* see those in everyday life? ;-)
>> 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).
Yeah, fair enough. This, presumably, is why we also have the index of
dispersion! :-D
>> 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!
Heh. You know, all I was *actually* trying to find out in the first
place is whether the reflections on a coloured surface are themselves
coloured.
It seems I get rather side-tracked. Again.
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