| http://www.w3.org/ns/prov#value | - To minimize alignment errors, in general an average optical path length difference between the deflected beams originating from the first wide strips 8 and the second wide strips 9 is created, which corresponds approximately to (2n+1)??/2, where n is an integer equal to or greater than 0 and ?? is the wavelength of the light used for aligning.
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