Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 45
spherical surface at aninclination to its prolonged radius, undergoes refraction in a degreeproportionate (as already explained) to that inclination. And theeffect upon the whole bundle will be such, that its rays will becaused to meet at a point, called the focus, some distance beyondthe centre of… … Parallel rays, falling on a plano-convex lens of glass,brought to a focus at the distance of the diameter of itssphere of curvature; and conversely, rays divergingfrom that point, rendered parallel. tion, called & plano-convex lens, will hereafter be shown to possessproperties which render it…
Microscopy · Biology
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