Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 271
ct; this difficultyis obviated by the use of a convex lens at Z, or a con-cave one at L ; the effect of the former being to reducethe divergence of the rays from the pencil to the samedegree with that of those from the object, and of thelatter, to increase the divergence of the rays from theobject,… … ELEMENTS OF OPTICS. 263 CAMERA OBSCURA. Used to copyfrom nature; Its essentialparts; § 88. This instrument is also used to copy fromCamera obscura;nature, and like the camera lucida, has variousforms, one of the best of which is represented in thefigure. AB (7 is a prismaticlens, which is nothing…
Mechanics · Acoustics · Optics
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