Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 46
face,and the contrary direction of its refraction (this being from thedenser medium, instead of into it), antagonize each other; so thatthe second convex surface exerts an influence on the. course of therays passing through it, which is almost exactly equivalent to thatof the first. Hence the focus… … Parallel rays, falling on a double-convex lens, broughtto a focus in the centre of its sphere of curvature ; con-versely, rays diverging from that point rendered parallel. 4. The distance of the Focus from the spherical surface willdepend not merely upon its degree of curvature, but also upon…
Microscopy · Biology
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