(2)纸板ENF是用两块纸板连接起来的。把纸板NOF向前折或向后折在纸板上还能看到反射光吗?
几个重要的概念;
(1)入射光线：_________(2)反射光线：_________
(3)法线：_________
(4)入射角：____________________________________
(5)反射角：____________________________________
● 分析和论证(反射定律)
(1)_____________________________________________;
(2)_____________________________________________;
(3)_____________________________________________;
(4)_____________________________________________。