HIGH-PERFORMANCE MICROSCOPES

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Optical microscopes from a magnified image by using lenses to bend light. Some special purpose microscopes used in industry and research  are designed for observing particular material, such as living cells. They produce magnifications of up to about 2000. Electron microscopes produce magnifications of as much as 50 million, although 2 million is more typical. Their images are formed by means of electrons focused by magnetic lenses. There are two main types: scanning electron microscopes (SEMs) scan electrons back and forth across the surface of specimen; transmission electron microscopes (TEMs)  transmit electron through a thin slice of the specimen.




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