Which city has seen many mirage phenomena?

There have been many mirage phenomena in Penglai, Shandong Province.

Mirage, also known as mirage, is a natural phenomenon formed by light refraction and total reflection. Its formation is closely related to weather situation, meteorological conditions, geographical location and geophysics. Mirages can be seen at sea or on land. It is characterized by the repeated appearance of the same place at the same time. Historically, there have been "mirage" scenes in many cities. One of the most famous is Penglai, Shandong, China.

Penglai, located in Yantai City, Shandong Province, is a city with a long history and profound cultural heritage. Since ancient times, Penglai has been famous for its unique natural landscape and human landscape. Among them, the most magical landscape is a "mirage".

According to records, the phenomenon of "mirage" in Penglai first appeared in the Northern Song Dynasty. At that time, local fishermen and officials had witnessed this spectacle with their own eyes, and many people even mistakenly thought they had seen a fairyland. In the Qing Dynasty, there were endless records about Penglai's "mirage". It is said that once a mirage appears, you can see sights such as cities, pavilions and palaces, which are hidden and changeable, giving people a mysterious feeling.

The reasons for the formation of mirage

A mirage is an illusion formed by refraction of distant objects, which is caused by the temperature gradient formed after the sun raises the ground temperature. Due to different densities, light will be refracted at the boundary of temperature gradient. Our brain thinks that light always travels in a straight line, but when it passes through the low-temperature and high-density atmosphere, it will be refracted downwards, so the distant objects in the brain will be higher than the actual ones.

Mirages often occur at sea, because the air humidity and thickness in a certain range of the ocean are relatively high, so that a large area of water vapor mistakenly forms a huge lens system. When the temperature near the ground changes sharply, it will cause a huge difference in atmospheric density, and the distant scenery will undergo abnormal refraction and total reflection when the light propagates, thus causing a mirage.

In addition, the occurrence of mirage is also related to the refractive index of air layers at different heights, and the water vapor content is an important meteorological factor that directly affects the refractive index. It is also related to the sudden change of temperature and relative humidity.

Baidu encyclopedia-mirage