Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 153
bliquely upon the face of a simple prism, we again have an ellipticalarea of illumination, and the refracted rays witlmi the medium willassume a direction as if emitted from the focal lines v^^ v^^ reaching thesecond surface of the prism, and being refracted by it to the eye at E, aa ifprojected… … Normal. Fig. 8. in which event the emergent pencil will appear to diverge from a point, atthe same distance from the anterior surface as the original source of lightC. In the case of a plate, the emergent pencil will also be of astigmatic* Now mentioned in Hand B<x)k of Optics, for Students of…
Lenses
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