Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
None of the given statements is correct.

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Physics
Mirage is due to:

Depletion of ozone layer in the atmosphere
Magnetic disturbances in the atmosphere
Equal heating of different parts of the atmosphere
Unequal heating of different parts of the atmosphere

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