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

  • question_answer
    In double slit experiment, the angular width of the fringes is 0.20o for the sodium light (l =\[5890\,{AA}\]). In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is                 [MP PMT 1997]

    A) Increase of\[589\,\,{AA}\]   

    B) Decrease of\[589\,\,{AA}\]

    C) Increase of\[6479\,\,{AA}\]

    D) Zero

    Correct Answer: A

    Solution :

    \[\theta =\frac{\lambda }{d};\theta \]can be increased by increasing l, so here l has to be increased by 10% i.e., % Increase \[=\frac{10}{100}\times 5890=589{AA}\]


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