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коллимация
The ideal input beam is a cylinder of light. No beam of finite dimensions can be perfectly collimated; at best there is a diffraction limit. In practice the input beam is a cone that is determined by the source size or aperture used. The degree of collimation can affect the S/N and the resolution
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The second largest of the Great Lakes of North America, bounded on the west by Michigan (U. S. ) and on the north and east by Ontario (Can. ). The ...
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