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Question

The fringe given shows a double slit experiment. P and Q are the slits. The path lengths PY and QY and nλ and (n+2)λ, respectively where n is a whole number and λ is the wavelength. Taking the central bright fringe as zero, what is formed at Y?
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A
first bright
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B
first dark
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C
second bright
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D
second dark
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Solution

The correct option is C second bright
Path difference between PY and QY =(n+2)λnλ=2λ, which corresponds to second bright fringe

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