Posted On: Sep 23, 2020
Ultraviolet is a form of electromagnetic radiation in which wavelengths range from 10nm to 400nm. Ultraviolet rays cannot be seen with naked eyes like visible light. The wavelength of the UV is shorter than the visible light and longer than X- rays. Sun is the ultimate source of UV rays. There are many types of UV rays like UV-A, UV-B and UV-C. Not only sun there are many other sources which release UV rays for example., electric arcs, some specialized lights such as black lights, tanning lights and mercury-vapor lamps. UV-B rays are very harmful for the DNA, skin and eyes. UV rays allow many chemical reactions to occur and there are many substances which glow or fluorescence in presence of UV.
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