Physics
Holography is a technique of

Recording a permanent three dimensional black and white photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional multicolour photograph

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Physics
Mirage is due to:

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

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