Retroreflector with acute dihedral angles.
An acute-angle retroreflector having three dihedral angles of 45, 60, and 90 deg was studied by use of the ray-trace method. Incident rays are reflected nine times in the retroreflector, and there are 26 different sequences for reflections. Errors in the dihedral angles will cause the directions of the reflected rays to diverge. A possible application of the acute-angle retroreflector is in target design for laser ranging.
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Sugimoto
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Minato