你也许在书里或者电影里见过这样的场景:沙漠中的旅者看到不远的空中悬浮着遥远的绿洲,他们欣喜若狂,加紧步伐,但却一直无法抵达那美丽的福地。这,就是“海市蜃楼”。当不同温度的大气在高空遭遇时就会形成这种奇妙的现象。因为不同的温度的气流密度不同(每立方英尺的体积中A比B的质量更大),而不同密度的气流就相当于两种不同的媒质:当光线从一种媒质(密度为A的大气) You may have seen such scenes in books or movies: Travelers in the desert saw distant oasis floating in the air. They were ecstatic and stepped up, but they could not reach the beautiful blessed land. This is the “mirage”. This wonderful phenomenon will occur when the atmosphere of different temperatures encounters at high altitude. Because different temperatures have different air flow densities (A in each cubic foot of volume is greater than B in mass), different densities of air flow are equivalent to two different types of media: when light passes from a medium (atmospheric density A )