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

  • question_answer
    An astronomical telescope of ten-fold angular magnification has a length of 44 cm. The focal length of the objective is [CBSE PMT 1997]

    A)            4 cm                                         

    B)            40 cm

    C)            44 cm                                      

    D)            440 cm

    Correct Answer: B

    Solution :

                       \[L={{f}_{o}}+{{f}_{e}}=44\] and \[|m|\ =\frac{{{f}_{o}}}{{{f}_{e}}}=10\]            This gives \[{{f}_{o}}=40\ cm\]


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