题在图1中填上适当的光学器件,使光路沿图示方向改变．此题的答案很多．每一种答案,都能使同学们深化理解相应的光学元件对光线的作用特点,此外还能培养作图技能,有利于培养发散思维．解法1 填平面镜．这是最容易想到的一种填法．作法 (1)作入射光线和反射光线所夹角的角平分线AO(用虚线表示),AO就是法线; In Figure 1, fill in the appropriate optics to change the light path in the direction shown. There are many answers to this question. Each answer can enable students to understand the characteristics of the corresponding optical elements to light, in addition to the training of drawing skills, which is conducive to the development of divergent thinking. Solution 1 Fill the plane mirror. This is the easiest way to think of a filling method. Practice (1) The angle bisector AO (shown by dotted lines) between the angles of the incident and reflected rays, AO is the normal;