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An extremely thin film of soapy water (n = 1.23) sits on top of a flat...

An extremely thin film of soapy water (n = 1.23) sits on top of a flat glass plate with n = 1.14. The soap film has a red color when viewed at normal incidence. What is the thickness of the film? (?red = 640 nm.)

My answer was 2.6016e-7 meters, which was wrong.

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