Microscope technique first involves making an image object, and then using a second lens to magnify the image. The compound microscope consists of two converging lenses: the objective lens (on the left) where the object to be viewed is placed, and the eyepiece lens (on the right) which functions as a magnifying glass. The objective lens has a focal length fobj (with focal points indicated by **), and the eyepiece lens has a focal length feye (with focal points indicated by 0"). The lenses are separated by a distance L. To correctly determine the kinds of images formed by each lens, the picture may not scale accurately.
The image formed by the objective lens is used as the object for the eyepiece lens. The eyepiece lens then forms its own image. This image formed by the eyepiece lens is the final image. To determine the kind of image formed by the eyepiece lens, we need to know the location of the image formed by the objective lens.