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

  • question_answer
    In a laboratory four convex lenses \[{{L}_{1}},\,{{L}_{2}},\,{{L}_{3}}\] and \[{{L}_{4}}\] of focal lengths 2, 4, 6 and 8 cm respectively are available. Two of these lenses form a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are [MP PMT 2001]

    A)            \[{{L}_{2}},\,{{L}_{3}}\]    

    B)            \[{{L}_{1}},\,{{L}_{4}}\]

    C)            \[{{L}_{3}},\,{{L}_{2}}\]    

    D)            \[{{L}_{4}},\,{{L}_{1}}\]

    Correct Answer: D

    Solution :

               To make telescope of higher magnifying power, \[{{f}_{o}}\] should be large and \[{{f}_{e}}\] should be least.


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