Q.

In Young’s double – slit Experiment, if source S is shifted by an angle ϕ as shown. Then central Bright fringe will be shifted by angle ϕ towards

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a

End A of screen

b

End B of screen

c

Does not shift at all

d

Either end A or B depending on extra phase difference caused by shifting of source

answer is B.

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Detailed Solution

At the position of central bright fringe, the path difference between the rays emerging from two coherent sources must be zero.In this caseNowSo to make the path difference zero, the central bright fringe must be on B side.
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