Posted: May 22nd, 2023
The existence of IR is usually between the visible light and the UV bands. Consequently, the wavelength of IR is longer than that of the visible light but shorter than that of UV.IR cannot be perceived by the human eye. However, it can be felt by the human body. Animals and humans generate IR by virtue of generating heat from their bodies. Radiations deemed to have a wavelength of 9.4um are categorized as IR. However the penetration power of IR is low compared to visible light. It is for this reason that the radiation cannot pass through ordinary window glass and plastic. On the contrary, IR passes through opaque objects such as germanium, silicon and polyethylene. The latter is used in the manufacture of Fresnel lenses, used to in IR sensors.
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