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DUMET Medical DUMET Medical Solved Paper-2011

  • question_answer
    For an aperture of size a illuminated by a parallel beam of light having wavelength \[\lambda ,\] the Fresnel distance is

    A)  \[\approx a/\lambda \]        

    B)  \[\approx {{a}^{2}}/\lambda \]

    C)  \[\approx {{a}^{2}}\lambda \]           

    D) \[\approx a/{{\lambda }^{2}}\]

    Correct Answer: B

    Solution :

     In this case, the Fresnel distance is equavelent to \[{{a}^{2}}/\lambda \]


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