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 301
ion of the reflected light.To prevent this, and converge to a single focus all the raysthat fall on the mirror, those with parabolic curves are con-structed. Such are known as burning mirrors. What is a concave mirror ? What is said of rays of light falling on a concavemirror ? How will parallel… … 296 CONCAVE REFLECTORS. Fig. 235. Diverging rays^ incident on spherical concave mirrors, willbe converged to a point further from the mirror than the focusof parallel rays, or the principal focus. 274. Images formed by concave mirrors vary in size andposition according to the distance of the object…
Physics
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