A beam of coherent light of wavelength 623 nm in air is incident on a rectangular block of glass with index of refraction 1.40. If, after emerging from the block, the wave that travels through the glass is 180 ° out of phase with the wave that travels through air, what are the possible lengths d of the glass in terms of a positive integer m? Ignore reflection.
This question was answered on: Jul 11, 2017
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