liar nature of the curvature of thecylindrical surface and the lens action isconvergent or divergent according as the surface is convex or concave. Inthe plane a m g k n h, passing through the axis a b c, rays are refractedwithout change in direction, this part of the lens having the same effectas… … Fig. 15 Action of Piano-Cylindrical Lens onParallel Ravs
Lenses · Eyeglasses
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