What is the difference between ray and beam?
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A beam is a thin projection of particles or waves. A ray is a hypothetical stream of light. A beam has a finite width, and it can be observed physically. A ray is a concept, which cannot be observed physically, and the ray has a zero width.
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ray is a path of a light wave represented by a line with an arrow. The arrow indicates the direction of in which light is travelling. Beam of light: Bundle of rays of light are called beam of light. They are represented as parallel rays of light travelling in the same direction.
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