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NEET Sample Paper NEET Sample Test Paper-52

  • 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 \[{{f}_{0}}\] of the objective and \[{{f}_{e}}\] of the eye-piece are-

    A) \[{{f}_{0}}=45\text{ }cm\text{ }and\text{ }{{f}_{e}}=-9\text{ }cm\]

    B) \[{{f}_{0}}=50\text{ }cm\text{ }and\text{ }{{f}_{e}}=10\text{ }cm\]

    C) \[{{f}_{0}}=7.2\text{ }cm\text{ }and\,\,{{f}_{e}}=5\,\,cm\]

    D) \[{{f}_{0}}=30\text{ }cm\text{ }and\text{ }{{f}_{e}}=6\text{ }cm\]

    Correct Answer: D

    Solution :

    For far point in telescope \[M.P=\left| \frac{{{f}_{0}}}{{{f}_{e}}} \right|=5~~~~~~~.......\left( 1 \right)\] \[L={{f}_{0}}+{{f}_{e}}\,\,=\,\,36\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,.......(2)\] \[\therefore \,\,\text{ }{{f}_{0}}=30\text{ }cm,\text{ }{{f}_{e}}=6\text{ }cm\]


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