Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 152
cils will have to beperpendicularly intercepted by the second surfaces as shown by the heavylines in Fig. 5; and in the event of the second surface occupying anoblique position, ab, Fig. G, with respect to the pencil A^ the mediummust be considered as a lens, having its optical center upon the axis… … Fig. 7. axis of the pencil is here oblique^ and the refracted pencil ceases to be acircular cone, projecting itself outside of the medium as an astigmaticpencil, of which/j and/^ are the focal lines at right angles to the axis, thewhole being deflected toward the base of the inherent prism P. 14A…
Lenses
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