Ultraviolet light

特許 係属中 Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, that is, in the range between ~310 nm and 100 nm, corresponding to photon energies from 4 eV to 12.4 eV. It is so-named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the color violet. Under ideal laboratory conditions, people can see infrared up to at least 1050 nm,[1] children and young adults ultraviolet down to about 310 to 313 nm[2][3][4] (also, those with aphakia can see some UV frequencies).