Remember that the energy of a light beam is proportional to the square of its amplitude.
a. Determine the percentage of light energy reflected in air from a single surface separating a material of index 1.40 for light of λ = 500 nm.
b. When deposited on glass of index 1.60, how thick should a film of this material be in order to reduce the reflected energy by destructive interference?
c. What is then the effective percent reflection from the film layer?
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