Physics
Holography is a technique of

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

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Physics
An integrated circuit is more advantages than a coventional circuit because

All listed here
A faulty part of a conventional circuit may be difficult to locate and repair
They make the electric equipments more reliable and easier for servicing
If a part of the integrated circuit fails the entire circuit is simply replaced

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