elec'tron mi"croscope

a microscope of extremely high power that uses beams of electrons focused by magnetic lenses instead of rays of light, the magnified image being formed on a fluorescent screen or recorded on a photographic plate: its magnification is substantially greater than that of any optical microscope.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

electron lenselectron multiplier
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