The magnifying power of a compound microscope increases when

  • 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 objective and eye-piece are increased
  • D
    Focal lengths of both objective and eye-piece are decreased

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$A$ microscope has an objective of focal length $1.5\, cm$ and an eye-piece of focal length $2.5\, cm$. If the distance between objective and eye-piece is $25\, cm$,the approximate value of magnification produced for a relaxed eye is?

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The image formed by an objective lens of a compound microscope is

An angular magnification (magnifying power) of $30X$ is desired using an objective of focal length $1.25 \, cm$ and an eyepiece of focal length $5 \, cm$. How will you set up the compound microscope?

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