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What is meant by UVA, UVB and UVC rays?

April 26, 2017meant Rays UVa UVB uvc

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What is meant by UVA, UVB and UVC rays?

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Ultraviolet radiation can be divided into UVA, UVB, and UVC rays. The UVA region of the UV spectrum extends from 320nm to 400nm. While there is still much research to do regarding the effect of UVA rays, they are known to contribute to aging. The UVB region of the UV spectrum extends from 290nm to 320nm. These rays produce sunburn, skin cancer, and photo aging. The UVC region of the UV spectrum extends from 200nm to 290nm. UVC is absorbed by the ozone layer of the stratosphere and does not reach the surface of the earth.