A search engine receives user-submitted queries, determines web pages that are relevant to those queries, and returns relevance-ranked lists of references to the relevant web pages. In the main cell, a second base layer of the second conductivity type, and an emitter layer of the first conductivity type are disposed. The geometrical properties measured or prescribed are the geometric properties of a plurality of rays incident upon the optical element and of a corresponding plurality of rays affected by at least the at least one unknown surface. The memory management unit is coupled to the queue management unit and the memory, and is configured to initiate a plurality of binary searches based on the plurality of search requests.