A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 221
istance C Bis the diameter of the circle D, formed by the convex surface of the lens C 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… … KAYS DISPERSED BY EEFEACTION.
Astronomy
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