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4. On the Four Surfaces of an Aplanatic Objective

Published online by Cambridge University Press:  15 September 2014

Hon. Lord M'Laren
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Extract

The art of figuring the lenses of a telescopic objective consists in correcting the spherical aberration by successive trials, until approximately aplanatic curves are obtained.

Type
Proceedings 1887-88
Information
Proceedings of the Royal Society of Edinburgh , Volume 15 , 1889 , pp. 355 - 379
Copyright
Copyright © Royal Society of Edinburgh 1889

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References

note * page 361 When u is less than unity, the refracted ray and radius vector lie on the same side of the normal, and the rays do not converge to or diverge from the pole. These constitute a family of parabolic or asymptotic curves, which, after describing a number of loops depending on the degree of the curve, go off to infinity.

note * page 362 This is the value found by putting r=x. See pp. 376–7, paragraphs 2 and 6.

note * page 363 Appendix, p. 377, § 5.