<P> There are two basic types of optical microscopes: simple microscopes and compound microscopes . A simple microscope is one which uses a single lens for magnification, such as a magnifying glass . A compound microscope uses several lenses to enhance the magnification of an object . The vast majority of modern research microscopes are compound microscopes while some cheaper commercial digital microscopes are simple single lens microscopes . Compound microscopes can be further divided into a variety of other types of microscopes which differ in their optical configurations, cost, and intended purposes . </P> <P> A simple microscope uses a lens or set of lenses to enlarge an object through angular magnification alone, giving the viewer an erect enlarged virtual image . The use of a single convex lens or groups of lenses are still found in simple magnification devices such as the magnifying glass, loupes, and eyepieces for telescopes and microscopes . </P> <P> A compound microscope uses a lens close to the object being viewed to collect light (called the objective lens) which focuses a real image of the object inside the microscope (image 1). That image is then magnified by a second lens or group of lenses (called the eyepiece) that gives the viewer an enlarged inverted virtual image of the object (image 2). The use of a compound objective / eyepiece combination allows for much higher magnification . Common compound microscopes often feature exchangeable objective lenses, allowing the user to quickly adjust the magnification . A compound microscope also enables more advanced illumination setups, such as phase contrast . </P> <P> There are many variants of the compound optical microscope design for specialized purposes . Some of these are physical design differences allowing specialization for certain purposes: </P>

What are the main parts of a compound light microscope
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