The microscope, sometimes called the compound
microscope, has two short focal length convex lenses. The objective gives a real, inverted
image of the object which is then magnified by the eye lens, giving a final virtual image.
In a microscope the object is slightly further from the
objective lens than its focal length. Shorter focal length objectives give higher magnifications
and this means that the object will be very close to the objective lens. The final image is usually at a distance of about 25 cm from the eye,
if it was closer than this you would get eye strain if you tried to use the microscope for a long
time.
