Laurence, Lionel · London, School of Optics · leaf 146
the Ver. line, as inFig. 137, or the Hor. line as in Fig. 138, is broken at the edges of the lens, orboth are broken. In a sph. lens there is only one point, i.e. the optical centre on the prin-cipal axis of the lens where there is no prismatic effect. In a plano-cyl. there is a line without… … Fig. 139. Fig. 140. The Prismatic Action of Sphs.—A sph. lens, at any point other than the0. C, acts as a prism, the prismatic power being greater as the part of the lens,through which the ray passes, is more distant from the axis. Let S S (Fig. 139) be a screen situated in the focal plane of a +1…
Optics
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