蜃景何以有正立与倒立之分？新疆阜康市一中穆尚礼蜃景（海市蜃楼）现象是空气中光的全反射性质的极好实例．在各种版本的高中物理教科书中，每当谈到光的全反射性质时，总少不了谈到它，并附有如图１和图２所示的海面上的Ｌ现蜃景和沙漠中的下现蜃景的两幅插图．其中上现... Why is there any difference between erection and inversion? 3. The phenomenon of Mushan Li Yujing (mirage) in Yikang City, Xinjiang, is an excellent example of the total reflection property of light in the air. In various editions of high school physics textbooks, when it comes to the total reflection properties of light, it is indispensable to talk about it, and it is attached with the L scene in the sea and the desert in the desert as shown in Figs. 1 and 2. Two pictures of the scene. Among them is...