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
KAYS DISPERSED BY EEFEACTION. … 500. How focal distance governed ? (Diagram.) 501. What is the focal distance of a plano-convex lens ? (Diagram.) 502. Effect of double-convex lens ? Amount of divergency of rays ? (Dia-gram.) 10 218 ASTRONOMY. BUBNING-GLASS. 503. Common spectacles, opera-glasses, burning-glasses,and refracting…
Astronomy
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