Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 485
, B, C (Fig. 27), are distant points, L a converging lens. Let us trace thecourse of the rays, commencing fromthe points A, B, O. The rays fromhe points B, situated in the axis, andr- the image of the point B will be formed atF, the principal focus. But it is differ-ent with the rays coming from A… … Zentmayer—A Lecture on Lenses. 427
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