Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 123
ne drawn through the centers ofcurvature of the two surfaces iscalled the principal axis. (CC,Figure 96.) The optical center (0) is the pointon the principal axis, midway be-tween the surfaces of the lens. The principal focus (F) is thepoint at which all rays parallel tothe principal axis are… … Figure 94. — Light Pass-ing THROUGH A DIVERGING Lens.
Physics
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