focal length of the lens. Optical Centre of a lens. Consider two points at whichthe bounding surfaces on opposite sides of a lens are parallel.Join these two points and let the line joining them cut theaxis in a point C. Then this point is found to be fixed on theaxis and is called the Optical… … Fig. 84. Cf the centres of curvature of the faces. Then EO and SO are parallel.Let ES cut AA in C. Then the triangles OEC, OSC are similar. 69-70] LENSES. 115 OC OR OATherefore Wc = G7S = 07A AC OAHence 27C=07Z7 Hence the point C divides AA in the ratio of the radii of thesurfaces and is therefore…
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