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An electron microscope (EM) is a type of microscope that uses a beam of accelerated electrons as the source of illumination, rather than visible light, to obtain high-resolution images of small samples. The basic components of an electron microscope include an electron gun, electromagnetic lenses, specimen holder, detector system, and display or imaging system. The electron gun, located at the top of the microscope, generates a stream of electrons. These electrons are emitted from a heated tungsten filament or a field emission electron source. The electrons are then accelerated to high velocities by an anode, typically maintained at a high voltage (between 10kV to 1000kV), depending on the type of microscope _____ _______ ____ _____ ______ ______ _____ _________ _______ ___ ________ ______.
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