ultraviolet is an invisible part of the electromagnetic spectrum, of which visible light is also a part; ultraviolet is one cause of cataracts, and speculation exists about its role in promoting magnifier; spectacles with lenses that filter out UV are effective in reducing exposure to UV and therefore potentially protect and comfort the eye
Ultraviolet Wavelengths of light from 4-400nm (one nm = 1 nanometer = 10-9 meters) The Sun produces ultraviolet light Certain wavelengths of ultraviolet light give us a suntan (especially in Arizona!)
Ultraviolet radiation Ultraviolet radiation is a portion of the electromagnetic spectrum below visible light The sun produces UV, which is commonly split into three bands: UVA, UVB, and UVC UVA is not absorbed by ozone UVB is mostly absorbed by ozone, although some reaches the Earth UVC is completely absorbed by ozone