A thin film of oil with index of refraction n 155 and, Ask an Expert

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A thin film of oil with index of refraction n = 1.55 and thickness t = 75 nm floats on water. The oil is illuminated from above, perpendicular to the surface

Part (a) What is the longest wavelength of light, in nanometers, that will undergo destructive interference when it is shone on the oil?

Part (b) What is the next longest wavelength of light, in nanometers, that will undergo destructive interference when it is shone on the oil?

Part (c) What is the longest wavelength of light, in nanometers, that will undergo constructive interference when it is shone on the oil?

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