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CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2010

  • question_answer
    An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and the eye-piece is 36 cm and the final image is formed at infinity. The focal length\[{{f}_{o}}\]of the objective and\[{{f}_{e}}\]of the eye-piece are respectively

    A)  45 cm and 9 cm

    B)         50 cm and 10 cm

    C)  7.2 cm and 5 cm

    D)         30 cm and 6 cm

    E)  5 cm and 7.2 cm

    Correct Answer: D

    Solution :

    \[\frac{{{f}_{o}}}{{{f}_{e}}}=5\] \[{{f}_{o}}=5{{f}_{e}}\] \[{{f}_{o}}+{{f}_{e}}=36\] \[5{{f}_{e}}=6\,cm\] and        \[{{f}_{e}}=30\,cm\]


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