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In a long and fruitful collaboration, Abbe carried out theoretical studies of optical principles, improving the understanding of the optical quality of a microscope.With the advancement of technology and improved optics, the microscope as we know it today came into being.
The top lens, the one people look through, is called the eyepiece. So today, when we say "microscope," we really mean "compound microscope".
It was Anton van Leeuwenhoek (1632-1723), a Dutch draper and scientist, and one of the pioneers of microscopy who in the late 17th century became the first man to make and use a real microscope.
Van Leeuwenhoek achieved greater success than his contemporaries by developing ways to make superior lenses, grinding and polishing five hundred and fifty lenses to make his new lens tube that had a magnifying power of 270x and could view objects one millionth of a meter (other microscopes of the time were lucky to achieve 50x magnification).
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Dating back to the first century when glass was first invented, the Roman's were investigating the use of glass and how viewing objects through it, made the objects appear larger.
Then, in the 13th Salvino D'Armate from Italy, made the first eye glass, providing the wearer with an element of magnification to one eye.
The microscope was said to have a magnification of 3x when fully closed, and 9x when fully extended.
Although ordinary magnifying glasses are basically a simple microscope, when we speak of the invention of the microscope, we really mean the "compound microscope".
Like many inventions today there are disputes in origins of the original inventors.
The same dispute applies to who invented the microscope.
In actual practice, there are several lenses used for both the objective and ocular, but the principle is that of two-stage magnification.