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[" Two identical narrow slits "S_(1)" and "S_(2)" are illuminated by light of wavelength "lambda" 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:- "],[qquad (1)/(1/2)(1)/(12)}],[[" (A) "(ell_(1)-ell_(2))=(2n+1)lambda/2," (B) "(ell_(3)-ell_(4))=(2n+1)lambda/2],[" (C) "(ell_(1)+ell_(2))-(ell_(3)+ell_(4))=n lambda," (D) "(ell_(1)+ell_(3))-(ell_(2)+ell_(4))=(2n+1)lambda/2]]

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