Physics
Holography is a technique of

Recording a permanent, sharp two diimensional black and white or multicolour photograph
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 three dimensional multicolour photograph

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Physics
A transformer

Converts electrical energy into mechanical energy
Converts DC to AC
Is used to decrease or increase AC voltage
Converts AC voltage to D.C. voltage

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