Fig. 5-1. Image magnification. X-ray images are shadows, and the geometry of their formation is similar to that relating to shadows formed by ordinary light. Thus the image becomes more enlarged the nearer the object is placed to the target, or the source of radiation. In the second diagram, the image of the object is smaller than in the first diagram because the object is farther from the target. In the third diagram, the target is more than 2 meters from the film, and the magnification is negligible (teleradiography). Click for high resolution image.