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... lens, so therefore an image magnified by one lens could be further magnified by another. Since its discovery, it has made astounding contributions to the innovation of science. For instance Robert Hooke, the Englishman who built it, determined the fact that living things are compiled of cells. Further advancements using the light microscope included the discovery of yeast fungus by Louis Pasteur, while Karl J. Ebert, a German bacteriologist discovered the Eberthella Thyphosa and additionally the discovery of tubercle and cholera bacilli by Robert Koch. The 19th century saw a dramatic progression in the improvement of the microscope due to the contributions of Carl Zeiss, who devoted significant effort to the manufacture of microscopes and Ernst Abbe, who carried out a theoretical study of optical principles. Development of the Electron Microscope: Electron Microscopes are scientific appliances that use a beam of highly energetic electrons to examine objects on a very fine scale. ...