Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 72
and thus to produce acolourless image. Thus let N m n(Fig. 15) represent the two extremerays of three pencils, which, with-out the field-glass, would form ablue image convex to the eye-glass at bb, and a red one atBB; then, ^vian Eye-piece by the intervention ot the held- adapted to over-corrected… … 28 OPTICAL PRINCIPLES OF THE MICROSCOPE. the difference in the place of these images, their rays, after refractionby it, enter the eye in a parallel direction, and produce a picturefree from false colour. If the object-glass had been rendered per-fectly achromatic, the blue rays, after passing…
Microscopy · Biology
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