Wave optics

  • 0_1554124940584_IMG_20190401_184925411_HDR~3.jpg
    Please explain how to solve this sum. Please show working.

  • @anag

    Answer is d/6. Just a simple geometry. As distance between the slits is d so At d/2 central bright fringe will form. And now we can say if x is the distance of that central bright fringe from O then 2d/3 = d/2 + x so x= d/6 . And even in options this is the minimum answer given and 0 we can't be sure of as other conditions aren't given to find out the fringe width so that we can check if 0 is possible or not.

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