Q.

The  central fringe in the interference pattern obtained in Young’s double slit experiment will be a dark fringe when the phase difference between the wave from the two slits is 

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a

zero

b

π2

c

π

d

π3

answer is C.

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Detailed Solution

Path difference at central fringe is zero. So if initial phase difference of  π is accruing at slits we can get a minima at central fringe

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