| 摘要 |
The reflector is constructed of transparent material and has on its rear face a plurality of first and second retrodirective reflector elements. The optical axes of the first reflector elements are arranged at a different angle than the optical axes of the second reflector elements. The first and second reflector elements are interspersed with each other so that the reflector appears substantially fully illuminated throughout its area to a viewer who is located within a zone defined by the optical axes.
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