Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 399
sesses a point, situated in its principal axis, which isof great importance. Rays of light, passing through that point, willundergo equal opposite refraction, so that it will leave the lens par-allel with the direction in which it entered. If we consider tiie lenswithout thickness, we simply say:… … the centres of curvature A and C of its surface, par-allel to each other, btit oblique to the axis A Q, thenconnect the two extremes B and D, and the line BD or its prolongation will cut the principal axis in 0,the optical centre. If the lens is a double convexone of equal radii, the optical centre…
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