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 544
y seen ; it is the principal focus. Or an image of an object isformed on a screen, their respectivedistances from which are then mea-sured, and from these distances thefocus is calculated from the dioptricformula (561). With a double concave lens, thelace (xb (fig. 507) is covered with anopaque… … -655] Optical Centre, Secondary Axis. 527 screen P, which receives the emergent rays, is moved nearer to or farllierfrom the lens, until A and B, the spots of light from the small apertures aand h, are distant from each other by twice ab. The distance DI is thenequal to the focal distance FD,…
Physics
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