DescriptionPrinciples of Microscope - Plate 7 Fig 4.jpg
English: Fig. 4. Diagram showing the optical anatomy of the apertural plane (Ramsden disk) of the eye lens. E.L., eye lens; A.P., Ramsden disk where the pencils of parallel rays intersect to form luminous points which radiate a mixture of blue and red rays, (vide p. 158, including Exps. 1 and 2).
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