Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 488
ich will cut the lensin its diameter BF. If we draw the line Up through the opticalcentre of the lens, a ray following it would not be refracted, as we haveseen before, and constitutes a secondary axis. lip is the line wherethe two planes cut each other, and consequently belongs to both planesLet… … 430 Chemistry^ Pht/sics, Technology, etc. R jF^and RE are symmetrical to the axis, and are exactly equallyrefracted, meeting at the point S. If the lens is now diaphragmeddown, so as to improve the aberration of the plane CD, we find thatwe have for one lens two distinct foci. If we focus, for…
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