NEET Sample Paper NEET Sample Test Paper-9

  • question_answer In an astronomical telescope, the focal length of objective lens and eyepiece are 150cm and 6cm respectively. In case when final image is formed at least distance of clear vision \[(D=25cm)\]. The magnifying power is:

    A)  29                              

    B)  30

    C)  31                              

    D)  32

    Correct Answer: C

    Solution :

    The magnification is given by \[m=\frac{{{F}_{O}}}{{{F}_{e}}}\left( 1+\frac{Fe}{D} \right)=\frac{150}{6}\,\left( 1+\frac{6}{25} \right)=31\]

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