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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    Four lenses of focal length \[\pm \,20 cm and \pm 200 cm\] are available for making a telescope. To produce the largest magnification, the focal length of eyepiece should be

    A)  +20                

    B)  -20                

    C)  +200              

    D)  -200

    Correct Answer: B

    Solution :

    As magnifying power \[M=\frac{{{f}_{o}}}{{{f}_{e}}}\] (for telescope) To produce largest magnification \[{{f}_{o}}>{{f}_{e}}\] Also, \[{{f}_{o}}\,and\,\,{{f}_{e}}\] should be positive \[\therefore \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{f}_{e}}\,\,=\,\,+\,\,15\,cm\]


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