What do the ancients think is the reason for the formation of mirage? Does this make sense? Please tell me your opinion.

1.1981July 10 At about 2: 40 pm, two small islands appeared in Pengpingge, offshore Penglai County, Shandong Province, China. 10 minutes later, the outline of the island becomes clearer and clearer. Roads, trees and mountains on the island.

2.1981At 2 o'clock in the afternoon of April 28th, Baibu Mountain in Zhoushan Islands, Zhejiang Province, a famous gentry's holy place in China, was calm, and ten Hong Kong compatriots and other tourists were visiting the mountain. Suddenly, in the middle of the vast sea of clouds in Chuyun Cave in the east, colorful auspicious clouds emerged, and a towering ancient temple with a glazed tile roof gradually appeared among the colorful clouds.

3.1August 2, 934, Nantong, Jiangsu, a cool day, unusually hot. In the afternoon, the sky suddenly overcast, and the phantom appeared on the Yangtze River. Towers, balconies, walls, trees and houses are distorted for more than 20 miles and can be clearly distinguished. After 30 minutes, they moved eastward and gradually lost.

4. (1)1933 May 1 1 day, this illusion also appeared in Zhucha Island outside JIAOZHOU Bay, Qingdao, and disappeared from 1 1:00 in the morning to 5:00 in the afternoon, with a history of four hours.

(2) It also appears in inland desert areas. Once, a group of people were walking in the desert of Inner Mongolia, and suddenly they saw a city in front of them, with houses, factories, vehicles and pedestrians-Hohhot, which disappeared after going further, but the city was hundreds of kilometers away.

This phenomenon has also occurred in Xinjiang, the Soviet Union, Central Asia and Arabia. Camel caravans are walking slowly in the desert. The weather is very hot and there is no wind at all. Just when the caravan wanted to go to an oasis to have a rest quickly, a sparkling lake appeared in front of it. The breeze rippled on the lake and the trees on the shore swayed. When stranded passengers speed up their steps, they hope to reach the lake as soon as possible.

Reasons for formation:

In the atmosphere, the density of each layer of air will be different. The density of cold air is higher than that of hot air. At the junction of two layers of air with different temperatures, light will also be refracted and reflected, showing a mirror-like image of a distant scene. If the lower air density is high and the upper air density is low, the illusion of looking up at the scenery in mid-air will appear, which is called "upper phantom" If the lower air density is low and the upper air density is high, there will be bow reflection, such as an object reflected underwater, which is called "lower phantom"

On the sea and on the river, in spring and summer, the water temperature is very low and the weather suddenly becomes hot. At this time, the air near the water surface is low in temperature and high in density, while the upper air is high in temperature and low in density, so it is easy to appear a "mirage", which is the reason why the mirage appears on the sea surface and river surface in the east of China.

In desert areas, the sand is scorched by the sun, and the air near the ground has high temperature and low density, while the air at high altitude is just the opposite. At this time, there will be a "lower illusion" in which mountains and trees are reflected on the sparkling lake.

Mirages appear not only in the coast and desert, but also in grasslands, seas and even big cities.