题目

如图所示，请画出光线进入玻璃和穿出玻璃后的光路图 答案：【答案】见解析所示【解析】由分析知，先画出法线，然后根据折射角和入射角的大小可大致确定折射光线的方向，如下图所示：They went on doing their experiment_________ they had failed many times.A.unlessB.untilC.thoughD.as long as