On Wed, 21 Jul 1999 23:18:20 EDT Entropyfoe@aol.com writes:
>The constancy of c as a function of wavelength has been tested
>experimentally >over a wide range of frequencies. It is constant for
the velocity in >vacuum >for the measured wavelengths. But for the speed in matter, [gases, >liquids, >and solids] the speed is dependent on wavelength, this is the
>dispersion, >second and third order optical effects where the index of
refraction >is a >function of the wavelength.
Yes, light thru glass, or signals thru a telephone wire, travel at only about 2/3 of the speed of light in vacuum.
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