半圆形玻璃砖横截面如图，AB为直径，O点为圆心。在该界面内有b两束单色可见光从空气垂直于AB射入玻璃砖，两入射点到O的距离相等。两束光在半圆边界上反射和折射的情况如图所示，则b两束光(         )

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