Infrared

thumb|A false color|false-color image of two people taken in long-wavelength infrared (body-temperature thermal) radiation Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those of red light (the longest waves in the visible spectrum), so IR is invisible to the human eye. IR is generally (according to ISO, CIE) understood to include wavelengths from around to . IR is commonly divided between longer-wavelength

idealized physical body that absorbs all incident electromagnetic radiation

electromagnetic radiation generated by the thermal motion of charged particles in matter

thermal electromagnetic radiation

weapon guidance system utilizing the target's infrared emissions to track it

special kinds of glass used for making various components of optical devices and systems

light with 15-1000 μm wavelength