Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 383
centred. . ,1 £ i • \ common error, one repeatedly met with, is that ot placing aconcave mirror 0 (fig. 208) so that the flame E is in its pnwci;*^facwa The result of this is that parallel rays are sent to B. Theserays are brought to a focus at a distance from B about equal to twicethe radius of… … -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.
Microscopy
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