A:凸透镜的焦距越小,其对光的会聚作用就越小
B:凹透镜的焦距越小,其对光的发散作用就越小
C:光无论沿什么方向射向凹透镜的光心后,其传播方向不发生改变
D:光无论沿什么方向射向凸透镜后,都能会聚在凸透镜另一侧的焦点上
下面是男性的身份证号码的是( )
——More and more students wear glasses in our school these days.——I agree with you. Students ___ keep on doing eye exercises to protect their eyes.