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Assertion In the YDSE set up shown in fi...

Assertion In the YDSE set up shown in figure a glass slab is inserted in front of the slit `S_(1)` as shown in figure Then zero order maxima (where path difference =0) will lie above point O.
Reason Glass slab will produce an extra path difference in the path of the ray passing through `S_(1)`

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The correct Answer is:
A
Whole fringe pattern shifts towards that side, where slab is inserted
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