The clinical use of prisms; and the decentering of lenses (1893)
Maddox, Ernest Edmund, 1860-1933 · Bristol : J. Wright ; London : Simpkin, Marshall, Hamilton, Kent · leaf 56
xperiment with strongprisms. The astigmatism of a prism is slightlyakin to that produced by a weak cylindrical lens,in that a cone of light, after having passed through PRISMATIC ABERRATION. 41 a prism, is somewhat flattened, its section becomingslightly elliptical instead of circular; or, in… … Fig. 22. vertical meridian. The inferior ray (a) is drawnso as to traverse the prism in the direction ofminimum deviation, and it therefore experiencesthe least possible deflection with which any raycan pass through a prism. Since the superior ray (J?) has a different angle ofincidence, it…
Lenses
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