02 February 2014 :: In a weekly Poll survey by Lenseye.co, 80 % people says, The ozone layer restricts Ultraviolet radiation, 7 % said Visible light & Infrared radiation Where as 1% voted for X-rays and gamma rays. The Question of the Weekly Poll was The ozone layer restricts ?
The Nominees were : Visible light, Infrared radiation, X-rays and gamma rays,Ultraviolet radiation
The ozone layer is a layer in Earth’s stratosphere that absorbs most of the Sun’s UV radiation. It contains relatively high concentrations of ozone (O3), although it is still very small with regard to ordinary oxygen, and is less than ten parts per million, the average ozone concentration in Earth’s atmosphere being only about 0.6 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres (12 to 19 mi) above Earth, though the thickness varies seasonally and geographically.
The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson. Its properties were explored in detail by the British meteorologist G. M. B. Dobson, who developed a simple spectrophotometer (the Dobsonmeter) that could be used to measure stratospheric ozone from the ground. Between 1928 and 1958 Dobson established a worldwide network of ozone monitoring stations, which continue to operate to this day. The “Dobson unit”, a convenient measure of the columnar density of ozone overhead, is named in his honor.
The ozone layer absorbs 97–99% of the Sun’s medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms on Earth.