What is the thinnest film of oil index of refraction 140, Ask an Expert

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What is the thinnest film of oil (index of refraction 1.40) floating on water in which green light (λ= 500 nm in air) is essentially eliminated by destructive interference from a beam of white light incident normally on this film? If the oil film were on glass (n=1.5), what thickness would be required?

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