UV ray

Patent Pending 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 approximately 400 nm and 10 nm, corresponding to photon energies from 3.1 eV to 124 eV. See below for a table of the different subtypes of the ultraviolet spectrum. It is so-named because the spectrum consists of electromagnetic waves with higher frequencies (and shorter wavelengths) than those visible to humans as the color violet. Under ideal laboratory conditions, children and young adults can see ultraviolet down to wavelengths of about 310 nm,[1][2][3] and people with aphakia can also see some UV wavelengths. Near-UV is visible to a number of insects and birds.