To obtain a magnified image at the distance of distinct vision $(D)$ using a simple microscope,the object should be placed:

  • A
    between the principal focus and optical centre of the lens.
  • B
    at the principal focus.
  • C
    slightly beyond the principal focus.
  • D
    at the distance of distinct vision.

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What is a compound microscope? Explain its construction with the help of a figure.

The magnification power of a compound microscope is given in terms of the magnification of the objective $m_0$ and the magnification power of the eyepiece $m_E$. The total magnification is:

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