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Veronica Ouyang 12C Electron microscopy The development of the electron microscope (EM) has had a significant impact on science research. Invented in the 1930s, the present day version of the EM can magnify up to 500,000 times and has a resolution of about 1nm. In contrast, the light microscope can magnify an object by a maximum of 1500 times and the resolving power is 200nm. That means organelles, which are only blurred images when viewed with a light microscope, can now be studied in great details. Many new structures therefore have been discovered using the EM. Instead of using light, the EM uses a beam of electrons to resolve objects. The beam, which is produced by a heated filament, can be bent and focused by electromagnetic lenses, in the same way the glass lenses are used in a light microscope. The image is projected into a cathode ray tube, rather than...

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