Physics
An optically plane surface reflects a beam of light

As diffused beams in all directions
As parallel beams in all directions
As a diffused beam in one direction
As a parallel beam in one direction

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Physics
Mirage is due to:

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

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