eater than twice the focal length theimage is diminished. 78. To obtain a formula connecting togetherthe positions of an object and its image formed bydirect refraction through a convex lens and todetermine the magnifying power. The formula andthe method of proof given in Section 76 apply, if we… … Fig. 95. Determine as in the last Section (Case 1) the position of pq,a virtual image of an object PQ formed by a convex lens. Let AQ = u, Aq = v, AF=f.Then RA=PQ, and we have u=AQ=PQ = RA_^AF= fv Aq pq pq Fq f + vWhence f(u-v}=- uv, 1 1 1 or = — 27. v v j 77-78] LENSES. 125 In this formula /…
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