Basic theory of infrared radiation

From 1860 to 1900, after 40 years of hard work, people built a complete theory of infrared radiation, the core of which includes the three laws of transmission, reflection and absorption, Kirchhoff's law, and Planck's law. The Wien's law and the Stefan-Boltzmann law, which are summed up from the experiment, are actually a special form of Planck's law and therefore are not independent laws. The thermal derivative is also derived from the above law and is therefore not an independent law.

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