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Q1 What is "infrared" ?
The word "red" is contained in "infrared". Is "infrared" really red in color?
Infrared rays refer to light which is invisible to the eye whose wavelengths fall within the electromagnetic wavelength range of 0.8 to 1000 microns.
Because infrared rays have such wide wavelength spectral bands, they are classified into near and far infrared, and both types are used in a variety of areas. For example, infrared rays in the range of approximately 0.8-1.5 microns are used in remote controls for TVs and video players. Those in the range of 5-1,000 microns have a deep relationship with heat energy, which is given off by various entities, and are used in a variety of areas ranging from household to astronomical applications.