Laurence, Lionel · London, School of Optics · leaf 103
Fig. 99. The Course of any Ray.—To construct the image of A, a point on theprincipal axis (Fig. 99), draw any line A KB, cutting the first focal plane at Kand the refracting plane at D. From K draw a line through 0 and from Ddraw DB parallel to K 0 which cuts the principal axis at B, the image of A. … Fig. 100. If the object-points is nearer than F1 (Fig. 100) horn A draw any line A E,and from Fx draw Fx C parallel to A E which takes the direction C D parallelto the principal axis and cuts the second focal plane in D. Connect D and Eand produce to A on the principal axis; then A is the virtual…
Optics
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