Notes on the Methods Employed in Biological Studies: Compiled Solely for the Use of Students in the Laboratories of the School of Biology, University of Pennsylvania (Classic Reprint) - Hardcover

Charles S. Dolley

9780267800353: Notes on the Methods Employed in Biological Studies: Compiled Solely for the Use of Students in the Laboratories of the School of Biology, University of Pennsylvania (Classic Reprint)

Hardcover

ISBN 10: 0267800355 ISBN 13: 9780267800353

Publisher: Forgotten Books, 2018

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Excerpt from Notes on the Methods Employed in Biological Studies: Compiled Solely for the Use of Students in the Laboratories of the School of Biology, University of Pennsylvania

Simple microscopes are usually termed magnifiers, and, whether consisting of one or more lenses, always remain simple. The most common are those with one or several double-convex lenses. The shorter the radii (the more curved the surfaces) are in these, the greater will be the magnifying power, and the higher this is, the less of the object's surface can be seen at once. Each additional lens increases the magnifying power in proportion to its curvature. The distance between the lens and the object, when this is seen most distinctly, is called the focus; at the point where the object is most distinct, the lens is said to be in focus; when indistinct or blurred, out of focus.

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