Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 400
s an infinite number of prisms, more so, asthe infinitely small portion of the lens, struck by the ray, may betaken for a tangent plane. Thus a converging lens may beconsidered as prisms united at their bases, and a diverging lens ofprisms united at their apices. As we already know that prisms… … The distance of the focus from the lens depends, 1st, upon the curva-ture; 2d, upon the refracting power of the material; and 3d, upon thethickness of the lens. Not to make the matter unnecessarily complicated, we will take thesupposition that cur lenses have an extremely small, or no thicknessat…
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