Physics
The reason for a swimming pool to appear less deep than the actual depth is

Interference
Refraction
Light scattering
Reflection

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Physics
Holography is a technique of

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

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