An oil film that is 400 nm thick is on top of water. The oil has n = 1.2 and the water has n = 1.33. White light in air is incident normal to the surface of the oil. What wavelengths in air within the limits of the visible spectrum (λ = 400 nm to 700 nrn) have destructive interference between the light that is reflected from the upper and lower surfaces of the oil film?
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