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 220
ed out on both sides. E is a concavo-convex lens, whose curves differ, but do not meet, if produced. F is a miniscus, or a concavo-convex lens, the curves of whose surfaces meet. 499. A double-convexlens converges parallelrays to a point calledthe focus ; and the dis-tance of the focus de-pends… … 497. What allowance for refraction ? Tables ? 498. What is a lens f (Draw and describe different, kinds ?) 499. Refracting power of double-convex lens? Focal distance? (Diagram,and illustrate.) ATMOSPHERICAL REFRACTION. 217
Astronomy
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