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OR a number of years aspheric surfaces have been employed in condensers to correct spherical aberration over a Iarge aperture.Such surfaces as * The reduction in optical path, in refraction, when a thickness of glass t is removed, is (n-1) t ; the increase in path, in reflection, by removing the same thickness, is 2 t ; thus for a given akeration in path in refraction approximately four times as much material must be removed as in reflection,
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H W Lee (1940) studied this question.
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