the success of convex lenses and concave lenses pave the way for the invention of a microscope. Zacharias Janssen from the Netherlands, together with his father made the first microscope in 1590. In 1668, Campini of Italy created a first-tuned microscope with adjustable lenses. The door of the world of science is wide open because Anton van Leeuwenhoek, a Dutch scientist and microscope manufacturer used a microscope to study bacteria in 1660. The magnifying tape he uses in a microscope has the capacity to zoom until the electron microscope further extends research in the field microbiology. With this tool one can observe objects of magnitude only a millionth of a millimeter with the help of the properties of electron waves. Han Busch of Germany, designed the microscope in 1926. The first practical electron microscope was used at the Technical School (Technische Hochschule) in Berlin in 1933 by Ernst Ruska and Max Knoll.
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