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17. A thin film of soapy water with an index of refraction of 1.43 has a thickness of 1.80 x 10 m at one point.

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17. A thin film of soapy water with an index of refraction of 1.43 has a thickness of 1.80 x 10" m at one point. The film is surrounded by air. Determine the two longest wavelengths of light that will interfere constructivelywhen reflecting from the soapy film. [T - 5, C-4]

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