This document provides an overview of microscopy. It discusses the key parts and early history of microscopes. The main points are: - Microscopes use an optical system of lenses to magnify and form images of objects too small to see with the naked eye. Anton van Leeuwenhoek in the 17th century made important early observations using simple microscopes he constructed. - Modern microscopes have two main parts - an optical system with objective and eyepiece lenses, and a mechanical system to hold samples. Different objectives allow different magnifications. - Early compound microscopes were developed in the 16th/17th centuries by Hans Janssen, Galileo Galilei and others, but it was not

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