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JEE Main & Advanced Physics Ray Optics Question Bank Microscope and Telescope

  • question_answer
    The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm. The maximum magnifying power of the telescope will be  [MP PMT/PET 1998; JIPMER 2001, 02]

    A)            ? 40                                          

    B)            ? 48

    C)            ? 60                                          

    D)            ? 100

    Correct Answer: B

    Solution :

                       Magnifying power of astronomical telescope            \[m=-\frac{{{f}_{o}}}{{{f}_{e}}}\left( 1+\frac{{{f}_{e}}}{D} \right)=-\frac{200}{5}\left( 1+\frac{5}{25} \right)=-\ 48\].


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