explain the formation of mirage
Answers
Answer:
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Explanation:
A mirage is an optical phenomenon that creates the illusion of water and results from the refraction of light through a non-uniform medium. Mirages occur on sunny days. The role of the sun is to heat the roadway to high temperatures. This heated roadway in turn heats the surrounding air, keeping the air just above the roadway at higher temperatures than that day's average air temperature. Hot air tends to be less optically dense than cooler air. As such, a non-uniform medium has been created by the heating of the roadway and the air just above it. While light will travel in a straight line through a uniform medium, it will refract when traveling through a non-uniform medium. If a driver looks down at the roadway at a very low angle, light from objects above the roadway will follow a curved path to the driver's eye.
Answer:
Mirage is an optical illusion where it appears that water has covered on the road at a distant place but when we go there, we don't find any water.
This is due to the Variable Refractive Index of medium and total internal reflection.
1) Density of air increases with height. Refractive index of air increases with density and also with height.
2) when the light from a tall object like tree or from the sky passes through a medium its surface refraction and takes a curved path because of total internal reflection.
3) The reflected light from sky is reflected from the ground for observer.
4) Hence observer feels that water being present on road which is virtual image of sky.
