A light with wavelength 411nm is shined on 15cm of water, Ask an Expert

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A light with wavelength 411nm is shined on 15cm of water with 850nm of oil on top of it. The oil has an index of refraction of 1.4 and the water has an index of refraction of 1.33. How much nanometer of oil must the layer increase to have a complete reflected destructive interference?

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