Laurence, Lionel · London, School of Optics · leaf 348
, is formed on the screen. Thesize of the image is carefully marked on the screen, the Cc. combination is re-moved, and a known thin Cc. is found that gives an image of equal size. F ofthe combination equals F of the thin Cc. Symmetrical Plane Method — Positive Combination. — To find… … Fig. 353. Let the system of lenses be suitably mounted (Fig. 353). Parallel lightfrom the collimator G is refracted by it, and the principal focus FB is formedon the screen S, whose position on the bench is noted. Now substitute the cross-wires D for the collimator and move them about until its…
Optics
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