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What is the most remarkable characteristic of ultraviolet light? What is the function of ultraviolet light for short?
(1) infrared has strong thermal effect, and can be used to make thermal spectrograms and infrared night vision devices;

(2) Ultraviolet rays can make fluorescent substances glow, and ultraviolet rays are used to identify the authenticity of banknotes and trademarks;

(3) Infrared rays have a strong thermal effect, and the heat of the sun is mainly transmitted to the earth in the form of infrared rays.

So, the answer is: heat; Making the fluorescent substance emit light; Infrared ray.

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