The word microscope is made from two Greek words, micros or ‘small’ and ‘scope’ or ‘watcher’. So, it means that through microscopes, small objects can be observed.
This instrument is used to see tiny things, which are invisible to the naked eye. Today, microscope is important to man in almost every industry.
A Dutchman named Antomi Van Leiuwenhock (1632-1723) discovered the ground glass lenses with which he examined the world around him. In 1670s, he made the first crude microscope using a tiny lens.
Today, microscopes are indispensable for scientific studies and research, and are also used for medical purposes.
Below Microscope info from Wikipedia (Read More):-
A microscope (from the Greek: μικρός, mikrós, "small" and σκοπεῖν, skopeîn, "to look" or "see") is an instrument for viewing objects that are too small to be seen by the naked or unaided eye. The science of investigating small objects using such an instrument is called microscopy. The term microscopic means minute or very small, not visible with the eye unless aided by a microscope. Anton Van Leeuwenhoek's new, improved microscope allowed people to see things no human had ever seen before.
http://en.wikipedia.org/wiki/Microscope