A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 62
en should thereforebe placed at this point. FOCAL LENGTH OF A BICONCAVE LENS. 51 XXI. FOCAL LENGTH OF A BICONCAVE LENS. Method I. Theory. — In Fig. 40 A C is a biconcave lens whose focus isat F, PP is the principal axis, PQ is an illuminated object, andPQ is its image. If we assume, as in the case… … Fig. 40 this case obtain a formula connecting the distance of the imageand of the object from the center of the lens C, with its focallength. QA and QC are two such rays, and as on emergingthey appear to come from Q, therefore QP\ the perpendicularfrom Q on PC, will be approximately the image of…
Physics
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