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J & K CET Medical J & K - CET Medical Solved Paper-2014

  • question_answer
    The distance for which ray optics is good approximation for an aperture 5mm and wavelength \[5000\overset{o}{\mathop{\text{A}}}\,\] is

    A)  18m            

    B)  30m

    C)  38m              

    D)  50m

    Correct Answer: D

    Solution :

     \[{{Z}_{F}}=\frac{{{a}^{2}}}{\lambda }\] \[{{Z}_{F}}\to \]Fresnel distance. \[{{Z}_{F}}\simeq \frac{{{(5\times {{10}^{-3}})}^{2}}}{5000\times {{10}^{-10}}}=\frac{25\times {{10}^{-6}}}{5\times {{10}^{-7}}}=50\,m\]


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