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In Young's experiment, what will be the ...

In Young's experiment, what will be the phase difference and the path difference between the light waves reaching (i) third bright fringe and (ii) third dark fringe from the central fringe. Take `lambda = 5000 Å`.

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The correct Answer is:
`(i) 6 pi` ; 15000 Å (ii) `5 pi` , 12500
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