Up to a certain sum of the interior angles on one side of the transversal the two lines might indeed meet. 截线一侧两内角到达一定的和数，两直线可能一定相交。
The coherence length revised is smaller than the classical, because the revised zenith angle is larger than the launch angle. 修正后的相干长度总比传统相干长度偏小，因为修正后的天顶角比发射角大。
