A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 222
istance C Bis the diameter of the circle D, formed by the convex surface of the lens O produced. 502. A double-concave lens dis-perses parallelrays, as if theydiverged from thecenter of a circleformed by the con-vex surface pro-duced. In this cut, the parallel rays A are dispersed by the… … RAYS DISPERSED BY REFRACTION.
Astronomy
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