作图题,保留作图辅助线。 (1) 如下图中,一束光线从空气斜射到水面时发生反射和折射,OB为反射光线,请作出入射光线和大致的折射光线方向; (2) 如图所示,SA、SB是光源S发出的两条光线,其中SA平行于主光轴,SB过左焦点,请画出这两条光线通过凸透镜后出射光线(注意标出箭头方向)。What does the man mean?
A.He didn’t know David was arriving on Tuesday.
B.He’s always busy on Tuesday.
C.He doesn’t like to drive at night.