Spherical aberration in thin lenses

Spherical aberration in thin lenses

Year: 1922

The author gives an elementary theory of the spherical aberration of thin lenses, using a notation which is due to Coddington where the aberration is expressed in terms of two factors, the shape and position factors. It is shown how to calculate quickly the aberration of any thin lens for any position of the object and to formulate a statement of the conditions under which the spherical aberrations of two thin lenses will compensate one another. The latter is confined to the simplest case when the lenses are close together (telescope objectives). The treatment is partly analytical, partly graphical. In addition there is a graphical solution of the problem as to the conditions under which such a two-piece lens may be achromatic, free from axial spherical aberration, cemented, and fr