Invisible rays from sunlight and lamps; potentially harmful to eyes, especially related to the development of cataracts.
The invisible part of the light spectrum whose rays have wavelengths shorter than the violet end of the visible spectrum and longer than X-rays. UVA and UVB light are harmful to your eyes and skin. UVC are blocked in the upper atmosphere and almost never reach the earth.
MS = That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants. AN = non-ionizing but short-wave UV is ionizing; black light goes here or under INFRARED RAYS depending on text but unspecified, index here UI = D014466
Radiation from the sun that can be useful or potentially harmful. UV rays from one part of the spectrum (UV-A) enhance plant life and are useful in some medical and dental procedures; UV rays from other parts of the spectrum (UV-B) can cause skin cancer or other tissue damage. The ozone layer in the atmosphere partly shields us from ultraviolet rays reaching the earth's surface.
Compare? Radiation from the sun in the invisible portion of the spectrum. Some UV rays (UV-A) enhance plant life and are useful in certain medical and dental procedures. Other UV rays (UV-B) can cause skin cancer or other tissue damage. The ozone layer in the atmosphere partly shields us from ultraviolet rays reaching the earth's surface.
The range of invisible radiation wavelengths on the border of the x-ray region, to just beyond the violet in the visible spectrum. It is from 4 nanometers to 380 nanometers in the spectrum.
Radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays, and are invisible to the naked eye.
