An experimental set up similar to young's double slit experiment to observe the interference of light.

Here SS2 - SS1 = lambda/4

write down the conditions for

(1)constructive interfernece

(2) destructive interference in terms of path difference S2p - S1P = delta

Does the central fringe observed in the above set up lie above or below O . Give reason

Path Difference at center= xd/D = λ/4λ/4= xd/DPath diffrence at the center = λD/4dSo the cetre bright fringe is shited down by : λD/4dSo the 1st constructive interference will be obtained at (λD/d-λD/4d)=3λD/4dAnd similarly the destructive pattern is also shifted!

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