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JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank Critical Thinking

  • question_answer
    Two point sources X and Y emit waves of same frequency and speed but Y lags in phase behind X by 2pl radian. If there is a maximum in direction D the distance XO using n as an integer is given by

    A)            \[\frac{\lambda }{2}(n-l)\]

    B)            \[\lambda (n+l)\]

    C)            \[\frac{\lambda }{2}(n+l)\]

    D)            \[\lambda (n-l)\]

    Correct Answer: B

    Solution :

               For maxima \[2\pi \,n=\frac{2\pi }{\lambda }(XO)-2\pi \,l\] or \[\frac{2\pi }{\lambda }(XO)=2\pi (n+l)\]   or \[(XO)=\lambda (n+l)\]


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