A type of microscope that uses magnetic lenses to transmit a beam of electrons through an object; the electrons are then focused on a fluorescent screen to form an enlarged image.
A Transmission Electron Microscope (TEM) passes the electron beam through a very thin slice of a specimen. A Scanning Electron Microscope (SEM) looks at the exterior of a specimen. A Scanning Transmission Electron Microscope (STEM) can produce a magnification of 90 million times.
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