Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 224
nvergesI * 5*/ >/ 5 f less. Conclusions. from which we perceive that convex reflectors tend toscatter the rays and concave reflectors to collect them. 53. If —, in Equation (M), be transferred to the first member, we find r ^ / F. Sum of the vergencies after which shows that the vergency after,… … the focus, draw the Fis- ^ construction of , T7r ri i -- foci for reflectors. extreme ray Jb 1), andthe line D F\ mak-ing with the incidentray the angle F D Fequal to the power ofthe reflector, thepoint F\ where this line meets the axis, will be the focus. The reason isobvious. § 54. By a process…
Mechanics · Acoustics · Optics
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