| http://www.w3.org/ns/prov#value | - A factor of merit in respect of an optical scanner, e.g., for a line scan, is the optical invariant E. The optical invariant is a system constant which at the exit pupil of the scanner can be expressed as E=.0.?????, where .0. is the aperture of the scanner arrangement, i.e., the factor determining the cross-section of the beam passed through the system, and ?? is the field angle of the scan.
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