The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 308
ve to collect the rays of light passing through them to afocus; while the last three are termed divergent lenses, andact to separate these rays. 283. Parallel rays incident on a double-convex lens areconverged to a focus at a distance from the lens, varying withthe curvature of its sides.—Let a, b,… … What kinds of lenses are shown by Fig. 240, and how are they formed ?How do the first three lenses differ from the last three ? What is said of par-allel rays incident on a double-convex lens? Explain this by Fig. 24L DOUBLE-CONCAVE LENS. 303 focus. With lenses of the same refracting medium this…
Physics
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