A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 222
RAYS DISPERSED BY REFRACTION. … 500. How focal distance governed ? (Diagram.)601. What is the focal distance of a plano-convex lens ? (Diagram.)502. Effect of doubU-conv«x lens ? Amount of divergency of rays ? (Dia-gram.) 10 218 ASTRONOMY. BURNING -GLASS. 503. Common spectacles, opera-glasses, burning-glasses,and refracting…
Astronomy
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