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This lecture covers the three main groups of lenses in a Transmission Electron Microscope (TEM): the condenser lens system, the objective lens, and the projector lens system. It explains their functions and roles in forming and projecting the electron beam onto the specimen, as well as the magnification process. The instructor describes the components of a typical TEM, such as the Jeol 200cx, and how each lens group contributes to the imaging process. The lecture also delves into the technical details of the lenses, including their configurations and adjustments for optimal performance.