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

  • question_answer
    A Galileo telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment will be     [BCECE 2005]

    A)            98 cm                                      

    B)            100 cm

    C)            150 cm                                    

    D)            200 cm

    Correct Answer: A

    Solution :

                       \[m=\frac{{{f}_{o}}}{{{f}_{e}}}\] Þ \[\frac{100}{{{f}_{e}}}=50\] Þ \[{{f}_{e}}=2\,cm\]                    Normal distance \[{{f}_{o}}-{{f}_{e}}=100-2=98\,cm.\]


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