Why does the asphalt road look like a pool of water in the sun? When literacy is carried out

Due to air refraction. It is a kind of mirage. When the surface temperature is high, the air near the surface is warmer, the density is lower, and the refractive index is reduced. In the absence of wind and the surface temperature is higher than the upper air temperature, such unevenness is very likely to be maintained. The air can be considered layer by layer, and the closer to the surface, the smaller the refractive index. According to Snell's law, when the incidence from top to bottom, the angle of refraction is greater than the angle of incidence. The refracted light becomes the next layer of incident light. However, when the angle of incidence is large enough, total reflection occurs and then comes out layer by layer. The refraction angle that emerges is equal to the initial angle of incidence. So we can see the effect as if the road surface is reflected, and in experience we will feel that there is water there. In fact, not only in the low places, but also on the flat road will also see this phenomenon. But low places are more likely to produce a feeling of standing water.

After reading this article, if you have a son who asks you this question, you will never be dumbfounded again!