| 摘要 |
In an optical system for receiving radiation from a field of view of variable direction, the radiation impinges on a detector (24), or, in the case of projection of a beam of variable direction, a light source is arranged at this point. A convex lens (20) and a concave lens (23) rotate together about a point (25) on the axis of a fixed concave lens (22) located therebetween. <IMAGE>
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