Q138 / 180 · AIIMS 2008 · Physics

The magnifying power of a compound microscope increase with

  • A
    the focal length of objective lens is increased and that of eye lens is decreased
  • B
    the focal length of eye lens is increased and that of objective lens is decreased
  • C
    focal lengths of both objects and eye-piece are increased
  • Correct answer
    D
    focal lengths of both objects and eye-piece are decreased.

Solution

Magnifying power of compound microscope $M=-\frac{v_o}{u_o}\left(1+\frac{D}{f_e}\right)=-\frac{L}{f_o}\left(1+\frac{D}{f_e}\right)$

Hence, the correct answer is option: 'D'.

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