Laurence, Lionel · London, School of Optics · leaf 269
base-apex line from the horizontal. Then, since sin r=V/A and cos r=H/A, V=A sin r and H=Acosr. Thus let the base-apex line of a 5°d prism be at 20° from the horizontal.Then V=5x-3420= 1-71°, and H=5x-9397=4-698°. If the base-apex line is at 45°, a 6A has V=6x-7071=4-24AandH=6x-7071=4-24A. OBLIQUE… … Fig. 276. If with a 6A a Hor. effect of 3A is needed, cos /-=3/6=-5=cos 60°, sothat the base-apex line must be at 60°, V being -6x -866=5-2A. If the angular distance=r of the base-apex line be taken from the Ver., V=A cos r and H=A sin r. If a prism of 8A has its base at 30° left eye,-its…
Optics
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