Introduction To Optics And Elasticity
ASTRONOMICAL OPTICS AND ELASTICITY THEORY: ACTIVE OPTICS METHODS（2009）
Abstract
The idea of using a mirror that provides optical rays all converging to a single point originated in the Hellenistic period
of Greece more than two millennia ago. Because of the straightforward geometrical properties of conics as meridional sections
of stigmatic mirrors, catoptrics was constituted long before dioptrics. Nevertheless, and surprisingly, the first telescopes
built were not reflectors but refractors.
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