Laurence, Lionel · London, School of Optics · leaf 244
s confused. 232 GENERAL AND PRACTICAL OPTICS In Fig. 244 let a pencil of light be incident on a lens from a distant pointA, situated on the secondary axis AX; then S S is the first and M W thesecond plane, in this case S S being vertical and M M horizontal. All raysin a first plane as g, and c, b… … Fig. 244. Thus the first line is the focus of the first plane, while the second line is that ofthe second plane, each focal line being at right angles to the plane of whichit is the focus, and therefore corresponds in direction to the other principalplane. T is the meeting-point of a and c, while T…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
