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  created first microscope
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  famous "Micrographia" is published, which outlines Hooke's various studies using the microscope.
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  who used a microscope with one lens to observe insects and other specimen. Leeuwenhoek was the first to observe bacteria. 18th century: As technology improved, microscopy became more popular among scientists. Part of this was due to the discovery that combining two types of glass reduced the chromatic effect.
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  discovers that using weak lenses together at various distances provided clear magnification.