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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1997

  • question_answer
    In Youngs experiment, when the distance between slit and screen is doubled, while separation of slit is halved, then fringe width will be:

    A)  4 times                               

    B)  1/4                       

    C)  doubled             

    D)         unchanged

    Correct Answer: A

    Solution :

    In Young s experiment Fringe width \[\beta =\frac{\lambda D}{d}\] d = separation of slit D = distance between slits and screen                 \[\beta =\frac{\lambda (2D)}{d/2}=4\left( \frac{\lambda D}{d} \right)\] Fringe width becomes 4 times.


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