Laurence, Lionel · London, School of Optics · leaf 85
B is the object (Fig. 77). Draw A G; this, after refraction, diverges asif proceeding from F2. Draw A C through 0, whose direction is unchanged REFRACTION BY CURVED SURFACES 73 by refraction. Now A C and A G are more divergent in the denser than theywere originally in the rarer medium, and when… … If rays diverge from a distance equal to Fx they have their image in a planeD E midway between F2 and the surface. Let S G (Fig. 78) be incident on aCc. surface. Now S G cuts the plane N at a distance Fx from the surface inH, and if from H we draw the secondary axis // C we determine the pointwhere…
Optics
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