As shown in Figure 19.16 an object is placed just beyond the focal length of the objective lens. With the object's being beyond the focal length, a real image is formed as shown; a card could be held inside the microscope tube and this image would be projected upon it. The objective lens forms a real image that is larger than the object. The positions of the lenses are adjusted so this image formed by the objective lens falls just inside the focal length of the eyepiece. The eyepiece is then used as a simple magnifier to view this image; this image acts as the object for the eyepiece. Since this object for the eyepiece lies inside the focal length, an enlarged, virtual image will be produced. The eyepiece may be focused so this virtual image is at infinity-or wherever is comfortable for the viewer.