Asked by gerl

the light from a helium neon laser has a wavelength of 632 nanometers in air. the same light has a wavelength of 479.2 in glass. the frequency of the light is the same in air and glass. find the speed of the laser light in glass.
Answered by Steve
speed (m/s) = wavelength (m) * frequency (1/s)

v = λf

so, for a given frequency, the velocity is directly proportional to the wavelength.

Get v in air, and then you can figure v in glass.
Answered by Scott
speed = wavelength * frequency

so, the speeds are in the same ratio as the wavelengths

sglass = sair (wglass / wair)
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