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Electron microscopes allow the viewer to see much smaller objects than the original light microscopes. The wavelength of electrons is thousands of times smaller than the wavelength of light
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Electron Microscopy Electron microscopes allow the viewer to see much smaller objects than the original light microscopes. The wavelength of electrons is thousands of times smaller than the wavelength of light, with a ratio of around 0.01nm : 500nm, electron wavelength : light wavelength. This overcomes some of the problems faced with light microscopes, such as the depth of focus that can be obtained, the obstruction of objects and the blurred images that often occur due to the wavelengths of light. Electron microscopes can therefore show more detail then light microscopes and can be used to study much smaller objects in finer detail. As electrons cannot be seen as light can, the image is shown on a screen when the electrons are detected within the microscope. A stream of electrons is formed at a hot cathode, or 'electron gun' inside the microscope, which is then 'fired' at the object being viewed using...
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