Tag: Scanning electron microscope (SEM)

Electron Microscope: Introduction, Types, Differences and Its Applications

Electron Microscope- The organelles of the cell became known after the electron microscope was invented. It was developed in 1931 by Max Knoll and  Ernst Ruska in Germany. It consist of a source of supplying, a beam of electron of uniform velocity, a condenser lens for concentrating the electron on the specimen, a specimen stage for displacing the specimen which transmits the electron beam, an objective lens, a projector lens and a fluorescent screen on which final image is observed. For permanent record of the image, the fluorescent screen is replaced by photographic film. This microscope utilizes a stream of high speed electrons which are deflected by an electromagnetic field in the same way as a beam of light is reflected when it crosses a glass lens. Introduction of Electron Microscope The organelles of the cell became...

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