The geography of the heavens, and class-book of astronomy: (1858)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 312
RAYS DISPERSED BY REFRACTION. … cave lens disperses pa-rallel rays, as if theydiverged from the cen-ter of a circle formedby the convex surfaceluced. prodi In this cut, the parallel raysA are dispersed by the double-concave lens C, as shown atB; and their direction, asthus refracted, is the same as if they proceeded from the…
Constellations · Stars
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