"Long ago, in the hazy unrecorded past, someone picked up a piece of transparent crystal thicker in the middle than at the edges, looked through it, and discovered that it made things look larger. Someone also found that such a crystal would focus the sun's rays and set fire to a piece of parchment or cloth" I copied this paragraph on internet. It cannot be said better.
The optical microscope manipulates beams of light to produce magnification.
When the features of a studied object are less than a few microns, diffraction
takes over; light goes around such features. Electrons have associated
wave length smaller than one amstrong and difraction become a problem
only for features less than one amstrong or so. Actualy our transmition
electron microscope have a resolution of 4 nanometers. Check the link
below to see our electron microscope.
Transmission Electron Microscope
Science Museum - 3625 Highland Ave. Niagara Falls, NY 14305
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