在一般情况下,都是根据光的反射定律或光的折射规律来作反射或者折射光线。其实还可以利用像来作反射或者折射光线。因为,像是反射或者折射光线相交而成,或者是它们的反向延长线相交而成的。应用逆向思维可以先找到像,然后利用像作反射或者折射光线。如图1,要作a的反射光线,可 In general, the light is reflected or refracted according to the law of light reflection or the law of light refraction. In fact, you can use the image to reflect or refract light. Because, as reflected or refracted rays intersect, or their reverse extensions intersect. Using reverse thinking, you can find the image first, then use the image to reflect or refract light. As shown in Figure 1, to make a reflected light, you can