Information AboutMicroscope |
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A microscope (. The Science of investigating small objects using such an instrument is called Microscopy , and the term '''microscopic''' means minute or very small, not easily visible with the unaided eye. In other words, requiring a ''microscope'' to examine. The most common type of microscope—and the first to be invented—is the optical microscope. This is an Optical Instrument containing one or more Lenses that produce an enlarged image of an object placed in the focal plane of the lens(es). SIMPLE OPTICAL MICROSCOPE A ''simple microscope'', as opposed to a standard compound microscope (see below) with multiple lenses, is a microscope that uses only one lens for magnification. Van Leeuwenhoek 's microscopes consisted of a single, small, Convex Lens mounted on a plate with a mechanism to hold the material to be examined (the sample or specimen). This use of a single, convex lens to magnify objects for viewing is still found in the Magnifying Glass , the hand-lens, and the loupe. COMPOUND OPTICAL MICROSCOPE The diagram below shows a compound microscope. In its simplest form—as used by Robert Hooke , for example—the compound microscope would have a single glass lens of short Focal Length for the objective, and another single glass lens for the Eyepiece or ocular. Modern microscopes of this kind are usually more complex, with multiple lens components in both objective and eyepiece assemblies. These multi-component lenses are designed to reduce Aberrations , particularly Chromatic Aberration and Spherical Aberration . In modern microscopes the mirror is replaced by a lamp unit providing stable, controllable illumination. |
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