[I:http://www.rawfooddietdiets.com/wp-content/uploads/2013/04/RogerFrost19.jpg] Light is basically divided into two categories for the purpose of thermal imaging, visible light and invisible light. There is an almost infinite range of light beyond human range of vision. Light, as described in physics, is an electromagnetic wave that propagates through space at a fixed speed. This wave is further identified by its wave length, frequency and energy. As displayed below the actual wavelengths visibl
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