We can't see infrared light because the human eye is only able to detect light in the visible spectrum, which ranges from about 400 to 700 nanometers in wavelength. Infrared light has longer wavelengths than visible light, typically ranging from about 700 nanometers to 1 millimeter. This means that the energy of infrared light is lower than that of visible light, and our eyes are not sensitive enough to detect it. However, many animals, such as snakes and some insects, can see infrared light, and humans have developed technology, such as infrared cameras, that allow us to "see" in the infrared range.
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