| http://www.w3.org/ns/prov#value | - With reference now to the drawings, and particularly to FIG. I, the point 10 represents the location of a stationary point light source located in the focal plane of a lens 12 which moves in the direction of arrow 14 from the full-line position shown to the lower dotted line position. 8 indicates the angle through which the beam from source 10 is deflected as the lens 12 rotates through the angle
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