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Distortion (optics) In geometric optics, distortion is a deviation from rectilinear projection; a projection in which straight lines in a scene remain straight in an image. It is a form of optical aberration .
English: A diagram showing the path of the central color of light passing thorugh a direct-vision prism. Crown glass is shown in blue, flint in yellow. Crown glass is shown in blue, flint in yellow. As this kind of prism is dispersive , other colours will not emerge normal to the end surface.