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10 points about compound microscope

The compound microscope is a tool that can be used for many purposes. From medical research to a day at the beach, your curiosity is limited only by your imagination. As with all disciplines, it is best to learn the basics and to apply them each time you use the microscope. By knowing and following a few simple rules, your scientific experience will be enhanced.

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The compound microscope consists essentially of two or more double convex lenses fixed in the two extremities of a hollow cylinder. The lower lens (nearest to the object) is called the objective; the upper lens (nearest to the eye of the observer), the eyepiece. The cylinder is mounted upright on a screw device, which permits it to be raised or lowered until the object is in focus, i.e., until a clear image is formed. When an object is in focus, a real, inverted image is formed by the lower lens at a point inside the principal focus of the upper lens. This image serves as an "object" for the upper lens which produces another image larger still (but virtual) and visible to the eye of the observer.
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