Fifth book of lessons for the use of schools . 342 FIITH BOOK. KID Lenses are of various forms as here represented. Ais called a plano-convex, fromhaving one side flat, and theother rounded; B is a plano-concave, having one sidehollow; c is a double-convex,and has both sides rounded; D is a double-concave,with both sides hollow; E is a meniscus, (so calledfrom its moon shape), and has one side convex,and the other concave. The property of those whichhave a convex surface is to collect rays of light to afocus; and%hose which have a concave surface to dis-perse them. The following diagram will g
Fifth book of lessons for the use of schools . 342 FIITH BOOK. KID Lenses are of various forms as here represented. Ais called a plano-convex, fromhaving one side flat, and theother rounded; B is a plano-concave, having one sidehollow; c is a double-convex,and has both sides rounded; D is a double-concave,with both sides hollow; E is a meniscus, (so calledfrom its moon shape), and has one side convex,and the other concave. The property of those whichhave a convex surface is to collect rays of light to afocus; and%hose which have a concave surface to dis-perse them. The following diagram will give some idea of themanner in which light is affected by being transmittedthrough media of greater density and bounded by plane,convex, or concave surfaces :. The following will show how parallel, &c, rays arebrought to a focus by convex, or made to diverge byconcave lenses:
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