Dave wrote:
yes they do. but photons are propagating em waves, they aren't currents and
voltages, they are E and B fields. you can do the exact same calculations
using either E or B and the refractive index or epsilon/mu. again, all you
need is 2 of them, and you can compute the third, and then you know it all.

True, but how do they measure two of them? Ever
tried to measure the E-field of visible photons?
Hint: It is an irradiance (power density) time-
averaged measurement proportion to E^2.
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73, Cecil http://www.w5dxp.com