r-y the … Tig. 71. 00-56] REFLEXION AT SPHERICAL SURFACES. 95 numerical values of AQ, Aq and AO without reference to thesign. Then in fig. 71 $-$. Also, since RN= PQ, m__ pq _ Fg PQ- RN~ FNTherefore = WhenceThus may be written JL Now from this figure AQ is positive, while ^£ and AD arenegative. We therefore…
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