Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
some point beyond the principal focus on the right; and theconverging rays, A and B, will be refracted to some point between theprincipal focus, F, and the lens. If, now, the lens be removed, and the inscribed prisms substituted,they will have the same eflTect as the lens npon the several rays of… … prisms, as illustrated by the lower half of the lens in the diagram. Thefurther the segment is from the centre of the lens, the greater is theinclination of its faces, and, therefore, the greater will be the refractionof the rays passing through it. The central segments may be regardedas a plane…
Physics · Astronomy
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