Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 383
-Result of placing flame in principal focusof concave mirror. principal focus, but atits centre of curvature. The bulls-eye givesan illustration of whatis of wider application. … Fig. 299.—Mode of obtaining critical image. The method of obtaining a critical image with a condenser by meansof transmitted light is shown in fig. 299. E is the edge of the flame,S represents the sub-stage condenser, and F the object. F is thus the focal conjugate of E,£ ™ and F and E are in the…
Microscopy
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