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Question

Two identical narrow slits S1 and S2 are illuminated by light of wavelength λ from a point source P. If, as shown in the diagram, the light is then allowed to fall on a screen, and if n is a positive integer, the condition for destructive interference at Q is :-
1439771_e17e6732da764667a7913ee56c56a02f.png

A
(t1t2)=(2n+1)λ/2
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B
(t3t4)=(2n+1)λ/2
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C
(t1t2)(t3+t4)=nλ
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D
None of these
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