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(Solved): If the index of refraction of the coating is lower than that of glass, then the light incident on gl ...



If the index of refraction of the coating is lower than that of glass, then the light incident on glass through the coating experiences a phase shift due to reflection, as does light incident from air onto the coating. In order for cancellation to occur, the waves must be out of phase by lambda/2, meaning the coatin need only be lambda/4 thick.



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