Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 256
construction, the eye lens is placed in front of theimage at a distance equal to that of its principal focus, sothat the rays composing each pencil shall emerge from itparallel. Draw through the point p, where the image of Pwould be formed, the line p 0, to the optical centre 0 ofthe eye lens, and… … Galileantelescope; The rule for finding the magnifying power of this Magnifyinginstrument is the same as in the former case: for we pov;er fo™d analytically; have, which in Equation (67), after making/, and d, negative,gives A 11- (73) Ratio °f visual angles; and for parallel rays, A F, U m . . .…
Mechanics · Acoustics · Optics
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