Main Characteristics and Applications of UV Light

Ultraviolet light is outside the violet light in the spectrum and is invisible light. Sunlight is rich in ultraviolet rays. When the right number of ultraviolet rays irradiate the human body, it can promote the body to synthesize vitamin D to prevent rickets. It is the truth that children are often exposed to the sun. Ultraviolet rays also have a bactericidal effect, and wards in hospitals use ultraviolet rays to disinfect. However, too strong ultraviolet rays will harm the human body, so you should pay attention to protection. The oxygen in the atmosphere and the ozone layer in the upper sky have a strong absorption effect on ultraviolet rays, which can absorb most of the ultraviolet rays in the sunlight, so they can protect the organisms on the earth from ultraviolet rays.

In addition, ultraviolet light can stimulate chemical reactions that cause fluorescent substances to emit light and make photographic negatives light. The anti-counterfeiting of coins is to use this function of ultraviolet rays.

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