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NEET Sample Paper NEET Sample Test Paper-74

  • question_answer
    Three lenses of focal length \[+15 cm, +150 cm and + 250 cm\] are available, for making an astronomical telescope. To produced the largest magnification, the focal length of the eye-piece should be

    A)  +15 cm                       

    B)  +150 cm

    C)  +250 cm                     

    D)  None of these

    Correct Answer: A

    Solution :

    As, magnification \[\left| m \right|=\frac{{{f}_{o}}}{{{f}_{e}}}\left( 1+\frac{{{f}_{e}}}{D} \right)\] So,                   \[m\propto \frac{1}{{{f}_{e}}}\] \[\therefore \] In order to produce largest magnification the focal length of eye-piece should be small i.e., \[+\,15\,cm\] lens is used.


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