A thin layer of oil (n=1.6) is sandwiched between two layers of glass (n=1.5). Sketch the path that the light takes for this system. What must the minimum thickness of the film be if light of 632 nm is to be strongly reflected?

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A thin layer of oil (n=1.6) is sandwiched between two layers of glass (n=1.5). Sketch the path that the light takes for this system. What must the minimum thickness of the film be if light of 632 nm is to be strongly reflected? 

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