How the Optical Microscope Works

The most widely used microscopes are optical microscopes, which use visible light to create a magnified image of an object. The simplest optical microscope is comprised of one double-convex lens with a short focal length.

The compound microscope uses two lenses, an objective lens and an ocular lens, mounted at opposite ends of a closed tube, to provide greater magnification than is possible with a single lens.

The total magnification of a compound microscope is determined by the focal lengths of the two-lens system. This magnification can be more than 2000 times.
Canadian Heritage Information Network
Canada Museum of Science and Technology, Musée de la civilisation, Stewart Museum, Canadian Medical Hall of Fame, Museum of Health Care at Kingston, University Health Network Artifact Collection, University of Toronto Museum of Scientific Instruments, University of Toronto Museum Studies Program

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