Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 288
Fig. 137. REFLECTION AND REFRACTION. 277 which the conjugate foci A and A are on opposite sides ofthe double convex lens. Fig. 138 illustrates the secondcase. A and A are both on the same side of the lens. … A Fig. 138. For real images q is negative. The formula for converging lenses may then be written after changing all thesigns, M=l 9 P fWhen p = q we have Object and image are then equidistant from the lens,and the distance between them is 4f. They cannot approach nearer than this for a real image.…
Physics
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