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When I shine a green laser pointer (wavelength 532nm) on two slits, I find that what...

When I shine a green laser pointer (wavelength 532nm) on two slits, I find that what should be the central bright spot is actually a dark spot. Upon further investigation, I discover that there's a thin layer of oil covering one of the slits. The oil has an index of refraction of 1.5. What is the minimum thickness of the oil that would cause the observed effect?

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From the statement, the wavelength is 532 nm. The refractive index of oil is 1.5. The thickness of oil is, a 2(4-1) 532 nm 2(

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