The father of micorscope is Anton Van Leeuwenhoke,He was the first to see and describe what is cell look like,and he find the blood. The oldest micorscope is Leeuwenhoke micorscope. In 18th century Technical innovations improved microscopes, leading to microscopy becoming popular among scientists. Lenses combining two types of glass reduced the "chromatic effect" the disturbing halos resulting from differences in refraction of light.
   And we have electron micorscope,The introduction of the electron microscope in the 1930's filled the bill. Co-invented by Germans, Max Knoll and Ernst Ruska in 1931, Ernst Ruska was awarded half of the Nobel Prize for Physics in 1986 for his invention. In this kind of microscope, electrons are speeded up in a vacuum until their wavelength is extremely short, only one hundred-thousandth that of white light. Beams of these fast-moving electrons are focused on a cell sample and are absorbed or scattered by the cell's parts so as to form an image on an electron-sensitive photographic plate.
   Old micorscope magnified the object one hundred times. Now we have better micorscope in our class, those  micorscope can magnified object more then one hunderd times.