Laurence, Lionel · London, School of Optics · leaf 84
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… … Fig. 76. If the point S (Fig. 7G) is within Fv draw a line S D backwards to D inthe first focal plane and forwards to Q in the refracting plane. Draw thesecondary axis D C K; then S Q Q will be parallel to it after refraction.The latter produced back cuts the axis in/2, which is the image of 8. The…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
