Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 388
or is used,and whetherthe latter is focussedon the object or not. The dotted lines in fig, 306show rays falling on six differentpoints on a plane mirror: the continuous lines show the re- Fig. 808.—With the open aky, light iflflexions of these rays on the oh- forussed at all points, ject. The heavy… … 356 PRACTICAL MICROSCOPY therefore be considered. The extent to which it is limiting, so faras its influence upon the illuminating cone is concerned, is shown byan examination of the back of the lens of the objective when theeve-piece is removed. Fig. 307 shows the back of the objective whenbhe…
Microscopy
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