Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 265
made as greatas we please by giving a motion to the small reflectorwhich shall cause^ its principal focus to approach thefirst image, and drawing out, at the same time, the eyelens to keep the second image in its principal focus. Casscgrainiantelescope ; § 84. If the small reflector be made convex… … given by Equation (81), by changing the signs of Faand <?, which will give, Magnifyingpower; AT_A F. F. TO c-F, ?_.... (82) Objects appearinverted. and because the ratio of A to A is negative, objectsseen through this telescope with ordinary eye pieces,appear inverted. ELEMENTS OF OPTICS. 257 §…
Mechanics · Acoustics · Optics
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