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Two identical narrow slits S1 and S2 ar...

Two identical narrow slits `S_1 and S_2` are illuminated by the light of a wavelength`lamda` from a point source P. If , as shown in the diagram above , 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

A

`(l_1-l_2) =(2n+1)lamda//2`

B

`(l_3-l_4) =(2n+1)lamda//2`

C

`(l_1+l_2)-(l_3+l_4) =nlamda`

D

`(l_1+l_3)-(l_2+l_4) =(2n+1)lamda//2`

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The correct Answer is:
D
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