The electron microscope is used to examine a virus.

Since particles are also wave-like, an electron has an associated wavelength. In the electron microscope, invented by the German engineer Ernst Ruska, a beam of short-wavelength electrons examines a specimen with a higher resolution than can be obtained with an optical microscope. In 1942, Salvador Edward Luria, an Italian-born American biologist, uses the device to make images of a virus 10-7 meters in size.
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