Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 263
be thrown to one side, where it may be viewedwithout any appreciable loss of light. By this arrange-ment, the image would, of course, be distorted, but invery large instruments, employed to view faint and verydistant objects, it is not sufficient to cause much if anyinconvenience. This is ITerschel… … J/iTis a concave spherical reflector, of which the op-tical centre is at C, and having a circular aperture GII \ an ELEMENTS OF OPTICS. 255 image pq of any distant object P Q, is formed by it as Secondimase c* • i *°rme(i bya before; the rays from the image are received by a second small concave…
Mechanics · Acoustics · Optics
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