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QUESTION
A clear optical window made out of plastic (n=1.4) is coated with a hard antiscratch coating having n = 1.
A clear optical window made out of plastic (n=1.4) is coated with a hard antiscratch coating having n = 1.8. What should be the smallest thickness of this coating to maximize the amount of light reflected in the green partof the spectrum (for λ = 500 nm in air)?
