| http://www.w3.org/ns/prov#value | - An object which is variably disposed along an axis extending through the focal point such as orthogonally with respect to the array center, is reflected in the array to provide progressively shifted multiple images from this object as the object shifts orthogonally from the focal point along the axis, the array thus providing a pair of orthogonally displaced conjugate foci for the orthogonally shi
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