在实验室中，研究人员可以在光线传播通过空间时，对光的波峰稍作调整来造成发送光线的速度比极限的速度限制更快的印象。
In the lab, researchers can create the impression of sending light faster than the speed limit by tweaking the speed at which the wave crests of light propagate through space.
然而，如果给直接的光光线角度太宽，那么它将会违犯完整近路分类的极限。
However, if the beam Angle for the direct light is too wide then it will violate the limits of a full cutoff classification.
在物理镜头系统中，光圈调整光线进入系统的数量极限。
In a physical lens system, the aperture is adjusted to limit the amount of light entering the system.
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