ELECTRON MICROSCOPY - ELECTRONMICROSCOPY...

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ELECTRON MICROSCOPY Objects smaller than 0 . μ m cannot be clearly viewed with a light microscope.  They require the  use of an electron microscope.  Viruses and tiny internal cell structures would be examples.   These microscopes use a beam of electrons, with its much shorter wavlength, for illumination  instead of light rays, so the resolution is much greater (2.5 nm compared to 0.2 μ m for light  microscopes). Images produced appear on a screen and are photographed. Types of electron  microscopes: Transmission Electron Microscopy (TEM) --- the beam of electrons is passed through a  very thin-sliced specimen.  Electromagnets are used to focus.  Objects are most often  magnified 10,000- 100,000X or even more.  Since the beam of electrons has much less  penetrating power than light rays, the specimen must be sliced very
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