Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 213
IMAGES BY CONVEX LENSES. 203 II. When the Object is nearer the Lens than the PrincipalFocus. When it is at the Principal Focus, the rays becomeparallel, and no image is formed. 707.1. Image of an Object beyond the Principal Focus. The image is determined by finding two points, the extrem-ities, as… … Fig. 233. Draw secondary axes from the points, AX and BY, Fig. 233,through O, the optical center of the lens. The ray Ar from thepoint A is refracted towards the perpendicular, DF, when it entersthe lens, and upon emerging, from the perpendicular CE, so thatit reaches the secondary axis at A. So…
Physics
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