Physics
Solar cells work on the principle of

Photoconductive effect
Photoelectric effect
Photosynthesis
Photovoltaic effect

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Physics
Holography is a technique of

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

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