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Abstract
As we have already indicated in discussing geometrical optics in the previous two chapters, rays from a point object in a perfect optical system form a homocentric pencil of rays that converge to a point image; and the wave fronts (which, by definition, are perpendicular to the rays) are spherical. However, if in this approach abberrations keep the rays from passing through a common point, the wave fronts cannot be spherical.
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CHAPTER 5
47 PAGES


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