Elements of natural philosophy (Volume 2-3) . Geometricalrepresentationsof the sphericallenses. 202 NATURAL PHILOSOPHY. Double convexlens; Plano-convex;. Plano-concave Meniscus; Concavo-convex. curvature of the twosurfaces is the same,the lens is said to beequally convex. B, is a lens with oneof its faces plane, theother spherical, thislatter face and its cen-tre being on opposite sides of the lens, and is called a plano-convex concave; c, }s a ctouHe concave lens / each curved face and itscentre lying on the same side of the lens. D, is & plano-concave lens, having one face plane
Elements of natural philosophy (Volume 2-3) . Geometricalrepresentationsof the sphericallenses. 202 NATURAL PHILOSOPHY. Double convexlens; Plano-convex;. Plano-concave Meniscus; Concavo-convex. curvature of the twosurfaces is the same,the lens is said to beequally convex. B, is a lens with oneof its faces plane, theother spherical, thislatter face and its cen-tre being on opposite sides of the lens, and is called a plano-convex concave; c, }s a ctouHe concave lens / each curved face and itscentre lying on the same side of the lens. D, is & plano-concave lens, having one face plane andthe other concave. E, has one face concave and the other convex, the con-vex face having the greater curvature; this lens is calleda meniscus. F, like the meniscus, has one face concave and theother convex, but the concave face has the greatercurvature ; this is called a concavo-convex lens. The line containing the centres of the sphericalsurfaces, is called the axis. Different cases § 43. A moments consideration will show that all thesSsof^er^i; circumstances of vergency attending the deviation of lightby any one of these lenses, will be
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