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Two Different Phenomena or Application

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Submitted By hiutunglee
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Mirage is a misleading appearance. Most mirages occur on seas and deserts. Mirage is caused by different temperature. It happens when the ground is very hot and the air is cold. The hot ground warms a layer of air just above the ground. Cold air is denser than the warm air, therefore it has a higher refractive index. That means when light passes through a medium with a high index, it will bend more. On the other hand, as light passes through from a low index to a high index, it bends toward (perpendicular line) to the medium boundary. Conversely, when light travels from a high index to a low index, the light bends away from the line. For example, if you are lost in the desert. You have been walking for hours and you are running out of water. On the horizon, you see a puddle and you think you are saved. Unfortunately, it is not a puddle. It is a mirage. That is because the sunlight hits the warm air then it bends upward. The reason is because the warmer air is less dense than the cooler air. However, light will follow a curved path toward the cooler air. The explanation of this phenomenon is the colder air has a higher index of refraction than the warm air does. The human brain assumes that light travels in a straight line. We think that there is a puddle on the desert because water reflects light from the sky.

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