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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 33

An illustration from The clinical use of prisms; and the decentering of lenses, 1893, leaf 33
is the sum of these two deviations. The figure is so 2 18 PRISMS. constructed that the angle of incidence at the firstsurface (z), and the angle of refraction at the second{/) are equal, and in that case the deviations at thetwo surfaces are equal, or v = w. When we speakof the deviating angle of a… … \ X ; / \ i ■ / / v \ ■ / / / w 0 Fig. 12.—To shew the proportion between the refracting angles(A), and the deviating angles (0) of prisms. way, how the deviating angles of prisms increasemore rapidly than their refracting angles. Threeprisms are delineated, in principal section, withtheir apices…

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