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

  • question_answer
    The length of a telescope is 36 cm. The focal lengths of its lenses can be                                                [Bihar MEE 1995]

    A)            30 cm, 6 cm                           

    B)            ? 30 cm, ? 6 cm

    C)            30 cm, ? 6 cm                       

    D)            ? 30 cm, 6 cm

    Correct Answer: A

    Solution :

               Total length \[L={{f}_{o}}+{{f}_{e}}\] and both lenses are convex.


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