Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 405
lel rays, the longitudinal aberration is diflFerent fortwo diameters, and is greatest in the plane, laid through the Axisof the lens and the radiating point; therefore, the circle of aberrationbecomes the more elongated, as the more obliquely and marginallythe light strikes the lens, until it… … Hofmann—Development of the Chemical Arts. 347 marginal rays. The ray R will cut theaxis at F, and R farther off at F, andtherefore the image of a luminous pointis no more a point, but appears elon-gated, and in the extreme has the shapeof a coma, which in this case is di-rected downwards. If we…
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