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

  • question_answer
    Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90o. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio [NSEP 1994]

    A)            0 : 1 : 4

    B)            4 : 1 : 0

    C)            0 : 1 : 2

    D)            2 : 1 : 0

    Correct Answer: D

    Solution :

               Since P is ahead of Q by 90o and path difference between P and Q is \[\lambda /4\].Therefore at A, phase difference is zero, so intensity is 4I. At C it is zero and at B, the phase difference is 90o, so intensity is 2I.


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