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In Young's double slit interference experiment the wavelength of light used is 5000A°. If the phase difference between waves reaching a point p on the screen is 6π , then at the point p is

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Second bright band occurs

Second dark band occurs

Third dark band occurs

Third bright band occurs

answer is D.

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Detailed Solution

$Δx = \frac{λ}{2 π} Δϕ = \frac{λ}{2 π} (6 π) = 3 λ$
Third bright fringe is formed $∵ Δx = nλ$
For bright fringe

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