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NEET Sample Paper NEET Sample Test Paper-6

  • question_answer
    On introducing a thin sheet of mica (thickness \[12\times {{10}^{-5}}\,cm\]) in path of one of the interfering beams in Young's double slit experiment, the central frings in shifted through a distance equal to the spacing between successive bright frings. The relative index of mica is (wavelength of light used\[\lambda =6\times {{10}^{-5}}cm\])

    A)  \[1:33\]                       

    B)  \[1:5\]

    C)  \[2:5\]                         

    D)  \[1:478\]

    Correct Answer: B

    Solution :

    As, the shift to mica is \[S=\frac{(\mu -1)tD}{d}\] and width,          \[w=\frac{\lambda D}{d}\] Given,          \[S=w\] As,              \[t=12\times {{10}^{-15}}cm\] and             \[\lambda =b\times {{10}^{-5}}cm\] \[\Rightarrow \]               \[\mu =\left( \frac{\lambda }{t}+1 \right)=15\]


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