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Physic please help!

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A mixture of red light (vacuum = 661 nm) and green light (vacuum = 551 nm) shines perpendicularly on a soap film (n = 1.35) that has air on either side. What is the minimum nonzero thickness of the film, so that destructive interference causes it to look red in reflected light?
nm

  • Physic please help! - ,

    Wouldnt the thickness be blue lamda/4? ?

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