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

(N/A) simple microscope has a limited maximum magnification $(\leq 9)$ for realistic focal lengths. For much larger magnification,one uses two lenses,one compounding the effect of the other. This is known as a compound microscope.
$A$ schematic diagram of a compound microscope is shown in the figure.
The lens nearest the object,called the objective,forms a real,inverted,and magnified image of the object.
This image serves as the object for the second lens,the eyepiece,which functions essentially like a simple microscope or magnifier,producing the final image which is enlarged and virtual.
The first inverted image is thus near (at or within) the focal plane of the eyepiece at a distance appropriate for final image formation at infinity,or a little closer for image formation at the near point. Clearly,the final image is inverted with respect to the original object.