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DUMET Medical DUMET Medical Solved Paper-2009

  • question_answer
    For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm?

    A)  32m           

    B)  64m

    C)  16m           

    D)  8m

    Correct Answer: A

    Solution :

     For \[{{Z}_{F}}\]distance ray optics is a good approximation. \[{{Z}_{F}}=\frac{{{a}^{2}}}{\lambda }\] Here, \[a=4\times {{10}^{-3}}m,\lambda =5\times {{10}^{-7}}\,m\] \[\therefore \] \[{{Z}_{f}}=\frac{16\times {{10}^{-6}}}{5\times {{10}^{-7}}}=32\,\,m\]


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