Contrary to the customary way, some of the geometrical optics principles in free-space and two dimensions is deduced from blackbody radiation transfer. This is obtained from three hypotheses: (1) a blackbody radiates power proportional to its perimeter, and a convex blackbody does not radiate to itself, (2) reciprocity in radiation transfer, and (3) energy conservation. The analysis of an abstract relay element will lead to deduction of the reflection law in an unconventional form and new properties of the elliptical mirror as an ideal radiation transfer device.
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