| http://www.w3.org/ns/prov#value | - An apparatus comprising: a light transmitting member; an optical system for splitting a convergent light beam in said light transmitting member, reciprocating one of said splitted light beams along a first route between a splitting position and a predetermined plane lying in the space outside said light transmitting member in a form of roughly condensing it on said plane, and reciprocating the oth
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