Publisher's Synopsis
Excerpt from The Optics of Metallography
An objective may be said to possess seven qualities: magnifying power; aperture, or numerical aperture; resolving power; depth of focus, or penetrating power; illuminating power; ?atness of field; and defining power. To fulfill all of these requirements in a satisfactory manner necessitates considerable skill upon the part of the optician. These quali ties will be discussed one by one.
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