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JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank Young's Double Slit Experiment and Biprism

  • question_answer
    The figure shows a double slit experiment P and Q are the slits. The path lengths PX and QX are \[n\lambda \]  and \[(n+2)\lambda \] respectively, where n is a whole number and l is the wavelength. Taking the central fringe as zero, what is formed at X

    A)            First bright

    B)            First dark

    C)            Second bright

    D)            Second dark

    Correct Answer: C

    Solution :

                       For brightness, path difference \[=n\lambda =2\lambda \]            So second is bright.


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