| http://www.w3.org/ns/prov#value | - In FIG. 1, the numeral 1 represents a light source such as a halogen lamp or a xenon lamp; 2, 2 denote cold mirrors; 3, 3 designate condenser lenses for splitting the light emitted from the light source into beams of bidirectional light which are orthogonal to each other; 4, 4 designate heat protecting filters.
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