| 摘要 |
This invention provides an optical system for displaying visual information. The system has a main plane towards which light is projected, and from which the light travels in a different direction. The system is comprised of reflecting surfaces which are provided in the region of the main plane. Each surface is orthogonal to the main plane and each of the surfaces is orthogonal to an adjacent surface. Thus incident light, by successive reflections, is directed away from the main plane in a direction exactly 180 DEG opposite to that in which it would travel if a mirror were to be located in the main plane.
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