Jisho

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Noun
1. beam; light ray
Wikipedia definition
2. Ray (optics)In optics, a ray is an idealized narrow beam of light. Rays are used to model the propagation of light through an optical system, by dividing the real light field up into discrete rays that can be computationally propagated through the system by the techniques of ray tracing. This allows even very complex optical systems to be analyzed mathematically or simulated by computer.
Read “Ray (optics)” on English Wikipedia
Read “光線” on Japanese Wikipedia
Read “Ray (optics)” on DBpedia

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