There is a pirate scene in a mirage. Does the expert have any explanation for this incident?

Mirage is an abnormal refraction phenomenon, which is the result of light propagating in different vertical densities and being refracted.

Principle: When light is obliquely incident from one medium to another, the propagation direction will change, so that the light will be deflected at the junction of different media.

Understanding: The refraction of light, like the reflection of light, occurs at the junction of two media, but the difference is that the reflected light returns to the original media and the refracted light enters the other media. Because the propagation speed of light in two different substances is different, the propagation direction will change at the junction of two media, which is the refraction of light.

Formation conditions:

Mirages are closely related to the geographical location, geophysical conditions and meteorological characteristics of these places at a specific time. The abnormal distribution of temperature is the meteorological condition for the formation of most mirage.

Write down the formation of slug. In summer, when the sun burns in the desert, the sand is burnt. Because of the small specific heat of sand, the temperature of low-level air near sand rises rapidly, while the temperature of high-level air is still very low, thus forming an abnormal temperature distribution. Due to thermal expansion and contraction, the density of hot air in the lower layer near the sand is small, and the density of cold air in the upper layer is large, so the refractive index of air is small and the air in the upper layer is large. When the light reflected by a distant higher object enters the sparse air in the lower layer from the dense air in the upper layer, the incident angle gradually increases, and total reflection occurs when it is equal to the critical angle. At this time, if people look against the reflected light, they will see the cockroaches below.

Due to the deep color of pavement, asphalt pavement has strong absorption ability in the hot summer sun, and it will also form the distribution characteristics of cold and dense at high altitude and hot and dense at low altitude, so it will also form underflow.

A mirage in the desert is a refraction phenomenon when sunlight meets air with different densities. In the desert, sand is baked by the sun during the day, and the temperature on the surface of the sand layer rises rapidly. Due to the poor heat transfer performance of air, when there is no wind, the vertical temperature difference over the desert is very significant, with high air density in the upper layer and low air density in the lower layer. When sunlight enters the low-density air layer from the high-density air layer, the speed of light changes, and after the refraction of light, the oasis in the distance appears in front of people. On the sea or river, this kind of "mirage" phenomenon happens from time to time.

A mirage is an optical illusion, a virtual image formed by the refraction of light reflected by objects on the earth through the atmosphere. Phantom is a mirage for short. According to the principle of physics, a mirage is because different air layers have different densities, and light has different refractive indexes in air with different densities. That is to say, because the density between the cold air on the sea surface and the warm air in the sky is different, it will refract light.