An electron microscope uses condensing lenses to focus a beam of electrons to illuminate a specimen and
produce a magnified image. An electron microscope (EM) has greater resolving power than a light-powered
optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons.
They can achieve better than 50 pm resolution and magnifications of up to about 10,000,000x whereas ordinary,
non-confocal light microscopes are limited by diffraction to about 200 nm resolution and useful magnifications below 2000x.
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