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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2001

  • question_answer
    In an as tronomial telescope, the focal length of objective lens and eye piece are 150 cm and 6 cm respectively. In normal adjustment the magnifying power is:

    A)  20                                         

    B)  30

    C)  60                                         

    D)  15

    Correct Answer: B

    Solution :

    Given: Focal   length   of   objective   lens \[{{f}_{o}}=180\,cm\] Focal length of eye piece\[{{f}_{e}}=6\,cm\] In the normal adjustment, the magnifying power of telescope is given by \[=\frac{{{f}_{0}}}{{{f}_{e}}}=\frac{180}{6}=30\]


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