Laurence, Lionel · London, School of Optics · leaf 84
awn,and produced backwards to B. Thus AB is the virtual erect image of A B. Course of any Ray—Cx. Surface.—When the object is situated in theanterior focal plane the rays, diverging from any point D (Fig. 75) on it are, 72 GENERAL AND PRACTICAL OPTICS after refraction, parallel to each other and to… … Fig. 75. Any ray S D Q incident on the refracting surface from a point S on theprincipal axis passes through the first focal plane G H at I), and throughthe principal plane at Q, and its course, after refraction at Q, will be parallelto D C drawn from D through C; it therefore takes the direction…
Optics
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