UPSC CAPF AC 2017 Paper

Although the concentration of the ozone in the ozone layer is vary small, It Is vitally Important to lifo because it absorbs biologically harmful Ultraviolet (UV) radiation coming from the sun. UV radiation capable of penetrating nitrogen Is divided into three categories, based on its wavelength; these are referred to as UV-A (400-315 nm), UV-B (315-280 nm),andUV-C (280-100 nm).