Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 251
ye placed so asto see the imageformed by aconcave lens; Fig. 46. The angles A and A! will have contrary signs when onopposite sides of the axis of the deviating surface.The relation expressed by this equation answers to aconcave lens in which f,f will, Equation (27), be posi-tive for a real object.… … Equationcorresponding tothis case; A A 1 + t f (68) Heal imageformed by aconvex lens; whence we conclude that objects will always appear dimin-ished when seen through concave lenses. If the lens beconvex and theobject be situa-ted beyond itsprincipal focusf will be nega-tive, and Equa-tion (68)…
Mechanics · Acoustics · Optics
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