The geography of the heavens, and class-book of astronomy: (1858)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 311
DOUBLE CONVEX—FOCAL DISTANCE. … 674. What is a lens? Draw and describe different kinds. 675. Refracting power ofdouble-convex lens ? Focal distance ? Diagram, and illustrate. 676. How focal dis-tance governed ? Diagram, and illustrate. 677. What is the focal distance of a REFLECTION AND REFRACTION OF LIGHT. 311 It must be borne…
Constellations · Stars
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