what is rectillinear propagation of light?
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Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line. Light only deviates from a straight line when the medium it is travelling through changes density. This is called refraction.
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The rectilinear propagation of light means that light travels in straight lines as a wave. This can be observed in the well-defined shadows formed when an object blocks a light source and through the use of a pinhole camera.
The earliest surviving optical treatise, Euclid's Catoptrics1 (280BC), recognized that light travels in straight-lines in homogeneous media.
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