Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 485
Fig. 26 of the diameter of the globe behind it; thatis, the image lies in a curve, concentric with thelens, although the spherical aberration is notperceptible. To understand the correction of ^tthe curvature of field, we must make clearwhat is meant by depth of focus, and what theeffect of a…
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