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20. A thin film of soapy water with an index of refraction of 1.35 has a thickness of 2.50 x 107m at one point. The

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20. A thin film of soapy water with an index of refraction of 1.35 has a thickness of 2.50 x 10"7m at one point. The film is surrounded by air, Determine the two longest wavelengths of light that will interfere constructively when reflecting from the soapy film. [5 marks]

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