Laurence, Lionel · London, School of Optics · leaf 147
ay is deviateda distanceB F=l cm. at 50 cm., andB (?=2 cm. at 1 M, so that the prismaticeffect is the same as that of a 2A acting on a ray unrefracted by the lens.If the lens were +4 D, AB would meet the axis at 25 cm. from the lens andwould be there deviated 1 cm. The +2 D at 2 cm. from the axis… … The Prismatic Action of Cyls.—In Fig. 141 let the lens be a + cyl., whoseaxis A X is at 45°, B C is a Ver., and D E a Hor. line. On looking throughthe lens the points F G H on the vertical line B C are seen deflected by theprismatic action of the cyl. to FGW, upwards and to the left, the…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
