1. Ultraviolet light has shorter wavelengths than visible light. Though these waves are invisible to the human eye, some insects, like bumblebees,butterflies can see them !!!
2. Scientists have divided the ultraviolet part of the spectrum into three regions: the near ultraviolet, the far ultraviolet, and the extreme ultraviolet.
3. UV-light can be used in BANKS too. The bankers use it to check for fake notes. This process actually involves the use of UV-light, as when the notes are scanned by the UV-light.
4. Vitamin D is produced by the action of ultraviolet radiation on ergosterol, a substance present in the human skin.