Laurence, Lionel · London, School of Optics · leaf 262
meridian capable of producing a true focus is themaximum principal meridan, which has a spherical curvature. It is, how- 250 GENERAL AND PRACTICAL OPTICS evci, useful to assume that the oblique meridians of a cyl. have certain powersrelative to the maximum which contribute to the general power of… … Fig. 271. Fig. 272. Oblique Powers of a Cyl.—Fig. 271 represents a Cx. cyl. lens whose axisAx. is vertical, and maximum power M horizontal. Let tiis lens be a +5 D,and the object be a point at oo. Any ray of light incident in the meridian Ax.,central to the meridian M, suffers no deviation, it…
Optics
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