What are the conditions for the formation of a mirage in the sky?

Any reflection or illusion of an object that appears to reflect from a layer of air in the sky is called a mirage. Upper mirages are often found at sea, and in the north where there is snow cover. This is because the surface of the sea consumes heat when it evaporates and the temperature of the sea rises slowly, and in areas covered by snow and ice, the ice and snow surface reflects most of the sunlight and consumes a lot of heat when the snow melts, causing the temperature in the lower layers to become very low, so these places are most prone to strong temperature inversion.

If there is a strong temperature inversion near the ground level, the air density decreases rapidly with altitude, and the light rays propagation in the air layer where the air temperature increases with the altitude and the air density decreases sharply with the altitude, and the light from buildings on the distant horizon is refracted into the observer's eye, and a mirage appears.

Any reflection or illusion of an object that appears to be reflected from the ground is called a mirage. Most of the lower mirages occur in the desert during the hot season or at sea with warm currents in the winter. In the sunny and cloudless calm and windless weather, the sun shines on the dry sandy soil, the specific heat of the sand is small, the soil temperature rises very quickly, there is almost no water evaporation here, the heat transfer of soil molecules is extremely slow, and the heat is concentrated in the surface layer, so the air temperature close to the soil layer also rises quickly, but the upper air is still very cold.

When the near-surface layer is a strong cooling layer, the air temperature decreases quickly with altitude, the air density increases rapidly with altitude, and the light rays will bend upwards when propagating in the air layer where the air temperature decreases with altitude.

Introduction: Mirage is both an idiom and a phenomenon, and whenever one hears the word, one always feels a dreamy connotation. The formation of the mirage, in fact, can already be understood through the display of the word itself, first of all, most of the mirage appears on the surface of the sea, and in addition, the mirage has already shown that this scene is fake.

So what are the conditions for the formation of a mirage?

In general, people observe mirages due to the refraction of light.

Phenomena such as windless weather and good light. In summer, the temperature of the sea is usually normal. are cooler than the continents, so at sea level.

The flow of cold water above causes the temperature to be lower near sea level and warmer at places farther away from sea level, resulting in a cooler and warmer air temperature near sea level. And because the higher the temperature, the more active the air activity is, so the air density in the upper layer is said.

The lower it is, the higher the density of the air in the lower layer. In such a situation, it is easy to form a refraction reaction of light, and the refraction of light allows distant objects to be refracted to the upper layer, so people can see the image of things in the air of upper life. This image comes from the mainland area, for example, people see a building on the sea level, this building can be seen in ordinary life, sometimes the light is better, and you can even see the scene of the life of people who are active inside.

Therefore, the formation of mirages is generally in summer, and it requires good light and no wind, and in such a situation, a mirage will be formed.

There are many amazing phenomena in nature, but they can basically be explained by a variety of principles. However, these are still infiltrating scenes, and they are still rarely seen, and if you are lucky enough to see a mirage, you are very lucky.

The conditions that need to be met are that in order to meet the refraction conditions of light, there must be a corresponding propagation medium, there must be a water source, and there must be the propagation of light.

There needs to be a certain amount of light, there needs to be a sea level, and at the same time, there needs to be a certain illusion, and then it is refracted into a mirage.

The water content in the air must be up to standard, the light must be very good, the temperature must be right, and there must be no wind, and there needs to be a suitable angle.

A mirage is an illusion formed by the refraction of distant objects, which is caused by a temperature gradient formed by the sun to raise the temperature of the ground, and the refraction of light at the boundary of the air temperature gradient due to different densities.

To put it simply, a mirage is an optical phenomenon, a true embodiment of another space.

In the summer desert when the scorching sun is headed, the sand is scorched, because the specific heat of the sand is small, the temperature rises very quickly, the temperature of the lower air near the sand rises very high, and the temperature of the upper air is still very low, so that the abnormal distribution of air temperature is formed, due to the thermal expansion and contraction, the density of the lower layer of hot air close to the sand is small and the density of the upper layer of cold air is large, so that the refractive index of the air is small in the lower layer and large in the upper layer.

When the light reflected by a distant higher object is constantly refracted from the denser air in the upper layer into the sparse air in the lower layer, the angle of incidence gradually increases, and when it increases to an equal to the critical angle, total reflection occurs, at this time, if people look at the reflected light in the opposite direction, they will see the mirage.

The mirage scene is different from time to time.

A mirage, or mirage for short, is an atmospheric optical phenomenon. When light passes through layers of air of different densities, it is significantly refracted or fully reflected, and the distant scenery is reflected in the air, the sea or the ground, thus forming a variety of bizarre and bizarre scenes.

In summer, on the calm and windless sea, looking into the distance, you can sometimes see mountain peaks, ships, towers, pavilions, Bazaars, temples, etc. appear in the distant air The ancients did not understand the reason for this scene, and gave an unscientific explanation for it, believing that it was formed by the breath exhaled by the dragon (i.e., mirage) in the sea, so it is called "mirage", also called mirage A mirage is produced by the total reflection of light when it travels in the air with uneven density distribution In summer, the temperature of the lower air on the sea surface is lower than that of the upper layer. The density is larger than that of the upper layer, and the refractive index is also larger than that of the upper layer We can regard the air on the sea surface as being composed of many horizontal layers of air with different refractive indices When the light emitted by distant peaks, ships, buildings, people, etc., is shot into the air, due to continuous refraction, it deviates more and more from the normal direction, and the incident angle of the light entering the upper air continues to increase, so that total reflection occurs, and the light is reflected back to the groundThe sun shines on the sand, and the hot air layer close to the sand surface is less dense than the upper air, and the refractive index is also small The light rays from distant objects to the ground are refracted when they enter the hot air layer with a small refractive index, and the angle of incidence gradually increases, and total reflection may also occurThe above phenomenon can sometimes be seen on asphalt roads in the hot summer The air layer near the hot road surface has a smaller refractive index than the air layer near the hot sand surface The light from distant objects on the road surface may also be fully reflected, and from a distance, the road surface appears exceptionally bright and smooth, as if it has been poured with water