Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 543
Fig. 526 On Light. [552 tances. It is merely necessarj^ to place it in the focus of a double convexlens, as shown in fig. 504. Virtual foci.—A double convex lens has a virtual focus when the luminousobject is placed between the lens and the principal focus, as shown in fig. 504.In this case the…
Physics
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