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How ultraviolet & infrared rays affect the human body?

A. The human eyes can’t see ultraviolet and infrared rays, however, they have diverse impacts on the human body. The visible light ranges from 400 to 700 nm whereas ultraviolet rays range lies between 1 to 400 nm and infrared rays range lies beyond 700 nm. As shown in the below picture, the ultraviolet rays are classified in three different categories depending on the wavelength. UV-A (320-380nm), UV-B (290-320 nm) and UV-C (<200). UV-A is responsible for tanning effect on human body. UV-B activates Vitamin D and the absorption of calcium and other minerals in the body. UV-C is harmful and absorbed by the Ozone layer surrounding the earth. The overexposure to ultraviolet rays may cause skin cancer though. UV rays with wavelength shorter than 300 nm are effective in killing bacteria and viruses. Therefore, the UV lamps are used to sterilize surgical instruments in hospitals, water and the air in operation theaters. The water purifier is also equipped with UV lamps to destroy infectious bacteria and germs. Many food and drug companies use UV lamps for disinfestations of various types of products and their containers.

  • 2018-02-05T17:46:49
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