The invention of the compound microscope is attributed to several individuals who contributed to its development over time. However, the credit for the invention of the first practical compound microscope is usually given to Dutch eyeglass maker Zacharias Janssen and his father Hans Janssen. They are said to have invented the microscope around the year 1590.
The Janssen's microscope consisted of two lenses in a tube, which could magnify objects up to 9 times. It was not very powerful by modern standards, but it was a significant improvement over earlier magnifying devices, such as the single-lens magnifying glass.
Another Dutchman, Antonie van Leeuwenhoek, played a major role in the development of the compound microscope. He was a skilled lens maker who improved the design of the microscope and used it to make many important biological discoveries in the late 17th century.
Over time, other scientists and instrument makers contributed to the development of the compound microscope, improving its magnifying power, resolving power, and ease of use. Today, compound microscopes are widely used in many fields of science, medicine, and industry, and are an essential tool for researchers, educators, and students.