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You press two flat pieces of glass together so that a very thin layer of air is trapped between them. Incoming light can reflect from the boundary between the top glass plate and the air, and also from the boundary between the air and the bottom plate; the two reflected waves can then interfere with each other. What is the smallest spacing between the plates that will produce a strong reflection when red light of 680 nm wavelength shines perpendicularly on them?

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