Laurence, Lionel · London, School of Optics · leaf 348
efore at 2F from some plane—the 2nd equivalent plane—notyet located. But the distance between 2F and .FB, i.e. the difference in thebench readings of the position of S and S, is F, the equivalent focal length.Therefore measuring from S towards the lens a distance equal to 2F, thesecond equivalent… … % Fig. 354. Rotation Method—Positive Combination.—This is, perhaps, the quickestand is a most accurate method for finding the equivalent focal length andequivalent points of a combination, such as a photographic objective. PRACTICAL AND EXPERIMENTAL WORK 337 The secondary axes govern the position…
Optics
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