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Zacharias Janssen and his son Hans placed glass lenses in a tube. They observed that when looking through it, objects were greatly enlarged.

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Galileo discovered lenses and focussing in the 7th century.

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Giovanni Fabe was the first to use the term "microscope" from Galileo's compound microscope.

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Robert Hooke built the first microscope in 1665. There were two converging lens systems, which were the objective, and the eyepiece.

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A. V. Leeuwenhoek observed the first moving cells. He was also the first to see and describe bacteria.

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In 1931, the electron microscope was discovered. It uses accelerated electrons to view objects.

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Modern microscopes can magnify up to 10 million times.