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(i)In a Young's double-slit experiment S...

(i)In a Young's double-slit experiment `SS_2-SS_1=lambda/4`,where S_1 and S_2 are the two slits as shown in the figure.Find the path difference (S_2P -S_1P) for constructive and destructive interference at P.

(ii) What is the effect on the interference fringes in a Young's double-slit experiment, if the monochromatic source S is replaced by a source of white light?

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