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NEET Sample Paper NEET Sample Test Paper-66

  • question_answer
    A beam of light consisting of two wavelengths 650 nm and 520 nm is used to illuminate the slit of a Young's double slit experiment. Then the order of the bright fringe of the longer wavelength that coincide with a bright fringe of the shorter wavelength at the least distance from the central maximum is

    A) 1                                 

    B) 2

    C) 3                                 

    D) 4

    Correct Answer: D

    Solution :

    \[n{{\beta }_{1}}\,\,=\,(n+1){{\beta }_{2}}\] \[\Rightarrow \,\,\,\frac{n\times 650\times {{10}^{-19}}D\,}{d}\,\,=\,\,\,\frac{(n+1)\,\times 520\times {{10}^{\text{-}19}}\times \,\,D}{d}\] \[\Rightarrow \,\,n=4\]


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