“If diverging rays fall on the surface of the same lens, they will, by refraction, be rendered less divergent, parallel, or convergent, according to the degrees of their divergency, and the convexity of the surface of the lens.” -Comstock 1850
J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 237
2400×1403, 234.7 KiB
1024×598, 39.8 KiB
640×374, 21.8 KiB
320×187, 8.7 KiB