Compound Microscope:

A compound microscope consists of two (or more) positive lenses. The lens closest to the object is called the objective lens, and the lens closest to the eye is called the eye lens.

When an object is held up close to the objective lens (at a distance slightly greater than its focal length), the lens forms a magnified, real image.  This image is located slightly inside of the front focal point of the eye lens.  In turn, the eye lens forms a magnified, virtual image which the eye looks at (the eye forms a final, real image on the retina):