Owing to an optical effect called the Goos-H?nchen shift after the duo who discovered it, the ray would be knocked slightly off course on each reflection.

• 由于这之中存在一种称为“Goos-H?nchenshift”的光学效应（这是两位科学家发现的），光线在每一次的折射中将被轻微地偏移其运行轨迹。