An inverted image is formed in the first image plane and the three subsequent lenses in the namely the diffraction lens , the intermediate lens and the projector lens are used either to magnify this image or to magnify the diffraction pattern 在第一映象平面出现一个倒的图象，随后的第三透镜也就是衍射透镜，中间的透镜和投影透镜被用来放大图象或者放大衍射模式。
2.
This procedure ensures that within focusing be noted however , that for a ' three - lens ' microscope the necessity of this procedure has the consequence that s . a . d . can be obtained at only one magnification ( for a constant projector lens setting ) which is a considerable disadvantage of such microscopes 这个过程保证了尽管聚焦被标明了，过程中对于三透镜显微镜的的必须性有了结论： s . a . d .可以通过仅仅一次放大（通过一种固定的投影透镜设置）取得，对于这类显微镜来说，这是一个永远的弱点。
