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

  • question_answer If yellow light in the Young's double slit experiment is replaced by red light, the fringe width will                [MP PMT 1996]

    A)            Decrease

    B)            Remain unaffected

    C)            Increase                                 

    D)            First increase and then decrease

    Correct Answer: C

    Solution :

                       Fringe width \[(\beta )=\frac{D\lambda }{d}\Rightarrow \beta \propto \lambda \]            As \[{{\lambda }_{red}}>{{\lambda }_{yellow}},\]hence fringe width will increase.

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