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How is holography different than photography.

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coherent light not neededMonochromatic and coherent light is,necessary
Virtual image is not seenVirtual image is seen
Only intensity is recordedIntensity and phase both are recorded
2-dimensional image3-dimensional image
From a torn or shattered photograph, the,image cannot be reconstructedThe image can be reconstructed from even, a small fragment of the hologram
Information of each point of the object, is recorded at a correspondence point on the image. Hence there is a point to,point correlation between the object and the imageInformation of the entire object is, coded at each point of the image.
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