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Manipal Medical Manipal Medical Solved Paper-2009

  • question_answer
    A telescope has an objective of focal length 50 cm and an eye-piece of focal length 5 cm. The least distance of distinct vision is 25 cm. The telescope is focussed for distinct vision on a scale 200 cm away. The separation between the objective and the eye-piece is

    A)  75cm           

    B)  60cm

    C)  71cm           

    D)  74cm

    Correct Answer: C

    Solution :

    \[\frac{1}{{{v}_{o}}}+\frac{1}{200}=\frac{2}{50}\Rightarrow {{v}_{o}}=\frac{200}{3}=66.6\,cm\] \[\therefore \] \[L={{v}_{o}}+{{f}_{e}}=66.6+5\approx 71\,cm\]


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