Solve this:

Q24. In a modified set-up of Young's double slit experiment, it given that SS ₂– SS ₁ = 2$\lambda$/3 i.e. the source S is not equidistant from the slits S ₁ and S ₂.
                     
    (i) Obtain the conditions for constructive and destructive interference at any point P on the screen in terms of the path difference $\delta$ = S₂P –S₁P

    (ii) Does the observed central bright fringe lie above or below O? Give reason to support your answer.