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JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank Wave Nature and Interference of Light

  • question_answer
    Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see [CBSE PMT 1993; DPMT 2000; BHU 2002]

    A)            No interference                 

    B)            Interference with bright bands

    C)            Interference with dark bands                                          

    D)            Interference in which width of the fringe will be slightly increased

    Correct Answer: D

    Solution :

               The refractive index of air is slightly more than 1. When chamber is evacuated, refractive index decreases and hence the wavelength increases and fringe width also increases.


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