Can anyone tell me what is the difference from beam and ray ???
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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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The light traveling in any one direction in a straight line is called a ray of light. A group of light rays given out from a source is called a beam of light.
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