Answered: constructive interference | bartleby

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4. A 300 nm layer of oil (n= 1.5) floats on a puddle of water (n= 1.33). Reflected sunlight is observed from directly above. Which color (wavelength in vacuum) is brightly reflected (completely constructive interference)?

a) 520 nm

b)560 nm

c)600 nm

d)640 nm

e)680 n

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