Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 402
the lens, -/? than the more central ones ^7^, whicli j p cross at /. This is a result of the spherical surface of the lens, and iscalled spherical aberration. If we present a convex short focus lens to solar rays and produce asharp image of the sun on a piece of white paper, we will find thatthe… … 344 Chemistry, Physics, Technology, etc. tea:
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