noun
visible light; visible radiation
Scientific term for the portion of the electromagnetic spectrum that is visible to the human eye.
可視光は波長が約380から750ナノメートルの電磁波です。
Visible light is electromagnetic radiation with wavelengths from about 380 to 750 nanometers.
このカメラは可視光だけでなく赤外線も検出できる。
This camera can detect not only visible light but also infrared rays.
Infrared radiation, which has longer wavelengths than visible light and is felt as heat.
Compound of 可視 (kashi, 'visible') + 光 (kō, 'light'). The exact historical derivation is uncertain, but the term follows standard Sino-Japanese word formation patterns for scientific vocabulary.