Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 47
lf also flat, and in a plane perpendicular to the axis. If, as shown in Fig. 6, the stop P lies in front of the lens-system, then the chief rays, while still in the region in front of the lens, all intersect the axis in one and the same point, namely the point m at the centre of the aperture of the… … Fig. 6. — Paths of Chief Rays before and after Refraction. Spherical Aberration of Image of Front Stop. system be a simple converging lens, then the marginal rays after refraction cut the axis nearer to the lens than do the axial rays. Let m' , if" be the points of intersection of the axis for the…
Photographic optics
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