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The problem is that there is no mechanism (at least that I can see --
ahem) by which the eye (or a bit of film, or a CCD) will measure the
_wavelength_, rather than the _frequency_. Embed the film (or the CCD) in
plastic or glass, and expose it. It records the same color as it does
"free", in air (I've done this several times).
Your point that Physics should use frequency to describe the color of