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Haryana PMT Haryana PMT Solved Paper-1999

  • question_answer
    The focal length of the objective and eye piece of a telescope are 100 cm and 5 cm respectively. Final image is formed at least distance of distinct vision. The magnification of the telescope is :

    A)  36                                         

    B)  30

    C)  24                                         

    D)  20

    Correct Answer: C

    Solution :

                    Using the relation, \[M=-\frac{{{f}_{0}}}{{{f}_{e}}}\left( 1+\frac{{{f}_{e}}}{D} \right)\] \[=-\frac{100}{5}\left( 1+\frac{5}{25} \right)=-24\] Negative sign simply shows-that image is inverted


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