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

  • question_answer
    In an astronomical telescope, the focal length of objective lens and eye-piece are 150 cm and 6 cm respectively. In case when final image is formed at least distance of distinct vision. the magnifying power is   [KCET 2001]

    A)            20  

    B)            30

    C)            60  

    D)            15

    Correct Answer: B

    Solution :

               \[m=\frac{{{f}_{o}}}{{{f}_{e}}}\left( 1+\frac{{{f}_{e}}}{D} \right)=\frac{150}{6}\left( 1+\frac{6}{25} \right)=30\].


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