Laurence, Lionel · London, School of Optics · leaf 209
air. Then we have Q S=/t Q Q. But QQ=C-FBandQS=CC=(C-FB)jU or YB=C(/i-l)fr THE CURVATURE SYSTEM 197 Similarly an expression can be found for the anterior principal focus ofthe same surface M Q N. Here (Fig. 217) the plane wave advances from thedenser medium to meet the surface as M N, the retarded… … Fia. 218. Conjugate Foci—Single Cx. Surface.—Let f (Fig. 218) be any near objectfrom which diverges the wave M N to the surface P Q R, and let/2 be theimage formed by the image wave P Q R. Let TQ = Fp Q S = C andQ S = F2. Then T S=/* Q Q=^ (S Q - S Q) and TS=TQ + QQ + QS ... ia(C-F2)-Fi + (C-F) +…
Optics
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