define optics & ray optics
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Geometrical optics, or ray optics, describes the propagation of light in terms of "rays" which travel in straight lines, and whose paths are governed by the laws of reflection and refraction at interfaces between different media.
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In optics a ray is an idealized model of light, obtained by choosing a line that is perpendicular to the wave fronts of the actual light, and that points in the direction of energy flow. Ray theory (geometrical optics) does not describe phenomena such as diffraction, which acquire wave theory.
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