| 摘要 |
The disclosed hollow retroflector has three front optically flat reflecting surfaces arranged essentially in orthogonal reference planes, each surface being on a plate having a pivotal axis perpendicular to one of the reference planes and having an adjusting device remote from its pivotal axis for fixing the plate in position that is adjustable about its respective axis. The adjusting device and the means that establishes the pivotal axis cooperate with portions of the plates that are outside the aperture of the retroflector.
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