Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 124
iven,then a focal lengthmust be assumed.)Next, mark off Fand 2 F on both sidesof the lens, and placethe object beyond 2 F. Now, there are an infinite number of rays passing fromevery point of the object, but two rays are sufficient tolocate the image of any one point. Select the two rays,one of… … Figure 96. — Principal Points of a Lens.
Physics
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