Laurence, Lionel · London, School of Optics · leaf 239
ns, the latter varying as the squareof the aperture, and the former as the cube of the aperture. ABERRATIONS OF FORM 227 Influencing Factors.—The definition of an image depends on the small-ness of the circles of confusion of which it is constituted, and these circlesare dependent on the degree of… … Via. 233. Fia. 239. Best Form of Single Lens.—Spherical aberration is least when the rays ingeneral are, after refraction at the first surface, more nearly parallel to thebases of the virtual prisms of which the lens is formed, so that the totalrefraction is approximately equally divided between…
Optics
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