Sometimes when the thirsty traveler makes his way through the burning sands of the desert a lake suddenly appears before him just over on the horizon. The traveler then makes haste to reach this totally unexpected and welcome place welcome place of refreshment. Of course, the lake is not really there and what traveler sees is a mirage.
For a long time people thought mirages were hallucinations, an unreal vision like a dream that some people experience when they are ill. Then it was perfectly well, who were not hungry or thirsty. It was then learned that mirages are an optical illusion, a trick played by the air.
The temperature of the air we breathe differs according to the altitude. In the desert, air is warmer near the ground, which can extremely hot on summer days, and grows cooler as it rises upwards. Warm air is less dense than cool air and acts as a mirror or pool of water to reflect light. The reflections are often seen upside down as trees are in a still pool of water to reflect light. The reflections are often seen upside down as trees are in still pool of water. The warm, dense air also reflects the sky and the shimmering effect on the ground looks like a lake or pool.
Picture Credit : Google