File:Principles of Microscope - Plate 4.jpg

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Summary

Description
English: A. Diagrammatic representation of a glass cell filled with transparent highly refractive spherules lying in air. The opacity of the contents of the cell is seen to be due to the fact that the rays which here pass up through the floor of the cell are diverted from their course by refraction and reflection (vide pp. 27 and 28, Exps. 1-4). B. Diagrammatic representation of the same cell and spherules lying in a highly refracting enveloping medium. The transparency of the contents of the cell is seen to be due to the fact that the rays here pass upwards through the cell without being turned aside from their course by reflection or refraction (vide pp. 27-28, Exps. 1-4).
Date
Source https://en.wikisource.org/wiki/Page:Principles_of_Microscope.djvu/61
Author Almroth Wright

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Principles_of_Microscope_-_Plate_4.jpg

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Plate IV.

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