NEET Sample Paper NEET Sample Test Paper-1

  • question_answer The astronomical microscope consists of objective and eyepiece. The focal length of the objective is:

    A)  five times shorter than of eyepiece

    B)  shorter than that of eyepiece

    C)  greater than that of eyepiece

    D)  equal to that of eyepiece

    Correct Answer: C

    Solution :

    The magnifying power of an astronomical telescope is given by \[=\frac{{{f}_{o}}}{{{f}_{e}}}\,\left( 1+\frac{{{f}_{e}}}{D} \right)\] Therefore, in order to increase the magnifying power of a telescope, the focal length \[{{f}_{o}}\] of the objective lens should be large.

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