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Lenses

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Among all the various optical instruments used to control light, lenses are the most important as well as widely used. Lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light, converging or diverging the beam. These are basically made from glass or transparent plastic. There are different types of lenses available. A simple type of lens consists of single optical element. Moreover, the compound lens is a combination of simple lenses (elements) with a common axis. Various types of lenses are used in microscopes, telescopes, etc.