| http://www.w3.org/ns/prov#value | - d pair of plane surfaces; a light source to generate the illuminating light to illuminate the uneven surface of the object through said plane-parallel plate; and image-forming means for forming the image of the uneven surface of the object and including a reflecting surface formed at a tilt on a first side surface of said plane-parallel plate, so that among light rays scattered back into said plan
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