Jisho

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かしこうせん 可視光線
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Noun, Noun which may take the genitive case particle 'no'
1. visible ray​
Wikipedia definition
2. Visible spectrum​The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 750 nm. In terms of frequency, this corresponds to a band in the vicinity of 400–790 THz.
Read “Visible spectrum” on English Wikipedia
Read “可視光線” on Japanese Wikipedia
Read “Visible spectrum” on DBpedia

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