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Problem: The green line of gaseous mercury at 546 nm falls on a double-slit apparatus. If the fifth dark fringe is at 0.125° from the centerline, what is the slit separation?

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For minima to occur,

d sin(θ) = (n + 1/2)λ, where n is an integer (n = 0, 1, 2, ...)

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The green line of gaseous mercury at 546 nm falls on a double-slit apparatus. If the fifth dark fringe is at 0.125° from the centerline, what is the slit separation?

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