travels are calledpositive, lines drawn from the lens in the same direction asthat in which the incident light is travelling are negative. Consider now a concave lens on which a parallel pencil isincident, the rays are made to appear to diverge by refractionfrom a point F, fig. 85, on the same side… … Fig. 85. In the case of a convex lens, fig. 86, the parallel rays aremade to converge by the lens. The point F is on the opposite
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