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Question

The mirage in desert is caused because :

A
the refractive index of atmosphere does not change with height
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B
there is effect of height on refractive index
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C
light is reflected by the sand particles
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D
none of the above
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Solution

The correct option is C there is effect of height on refractive index
  • Mirages happen when the ground is very hot and the air is cool.
  • The hot ground warms a layer of air just above the ground.
  • When the light moves through the cold air and into the layer of hot air it is refracted (bent).
  • A layer of very warm air near the ground refracts the light from the sky nearly into a U-shaped bend
  • Hence the option B is the right answer

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