A mixture of red light ( vacuum = 640 m) and green light ( vacuum = 512
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Question:
A mixture of red light (vacuum = 640 m) and green light (vacuum = 512 m) shines perpendicularly on a soap film (n = 1.25) that has air on both side. What is the minimum nonzero thickness of the film, so that destructive interference causes it to look red in reflected light?
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