Tungsten filament 二电子显微镜技术 Beam of electrons Condenser lens (一)电子显微镜的 基本知识 objective lenses 1.电子显微镜与光学显微 Focal plane of 镜的基本区别 objective len 2电子显微镜的分辨本领 与有效放大倍数 Viewing screen 3电子显微镜的基本构造 A Figure 4-23 The optical path in a transmission electron tungsten filament is focused onto the specimen plane by the magnetic condenser lens. The electrons passing through the specimen are focused by a series of objective and projector lenses to form a magnified image of the specimen on a fluo rescent viewing screen or a piece of photographic filn. The entire columm, from the electron generator to the screen, is maintained at a very high vad ulm二 电子显微镜技术 ◼ （一）电子显微镜的 基本知识 ◼ 1.电子显微镜与光学显微 镜的基本区别 ◼ 2.电子显微镜的分辨本领 与有效放大倍数 ◼ 3.电子显微镜的基本构造