optics
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The Schmidt telescope uses a corrective lens (corrector plate) to achieve a wide field of view. It is one of the most widely used tools of astronomy.
Branch of physics that deals with the study of light and vision – for example, shadows and mirror images, lenses, microscopes, telescopes, and cameras. On striking a surface, light rays are reflected or refracted, and the study of this is known as geometrical optics.
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