Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 227
deviating surface. The deviated wave will no longer be spherical, but willbe of such shape that its section d d d o\ by a planethrough the axis of the deviating surface, will be the in-volute of the section c c F\ by the same plane, of thecaustic surface, taken as an evolute. If after deviation the… … ELEMENTS OF OPTICS. 219 to either segment Fz d or cf ci separately. If, on the con- virtual canstictrary, the wave recede from the caustic on being devia-ted, the caustic will be virtual. Caustics are finely illus-trated on the surface of milk when the li^ht is reflectedupon it from the interior…
Mechanics · Acoustics · Optics
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