Let’s talk about light first. 1. In addition to visible light (red, orange, red, green, blue, blue and purple), there is also invisible light (infrared and ultraviolet). 2. The wavelength and frequency of light are inversely proportional, that is, different lights correspond to different frequencies and wavelengths. 3. The human body continuously radiates infrared rays, and the higher the temperature, the stronger the infrared rays.
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