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" Q from the mirror, the distance of q from the mirror, and the radius of the mirror) ; any two of which being given, the third can easily be found. "
Manual of optics, by J.A. Galbraith and S. Haughton - Page 9
by Joseph Allen Galbraith - 1854
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Elements of Natural Philosophy Designed for Academies and High Schools

Elias Loomis - Physics - 1858 - 351 pages
...If we put D=AD ; d= AF ; r= AE, we shall obtain In this equation we have three variable quantities, any two of which being given, the third can easily be found. Example 1. The radius of a concave mirror is 10 inches, and light falls upon it diverging from a point...
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