A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 274
principle shown in Fig. 258. The arrow h c would be seen by the naked eye under the visual angleb A c. When the lens m is interposed, the rays are so refracted as to form prepared in the daguerreotype process ? How, in the photographic process ? Howare photographs printed from a negative ? 704.… … the visual angle DAE, and the arrow 7) Fig. 258. appears to be of the size D E, muchlarger than it really is. Sometimesan exceedingly minute object becomesvisible when brought very near theeye, but in that position the rays en-ter the eye with such divergency thata confused image is produced.…
Physics
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