Holography

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The technique of obtaining an image of a 3D body on a 2D photographic plate is termed as holography. The stored image is called  a hologram. The whole process is based on the interference produced by the interaction of two beam monochromatic light waves under certain conditions .




The hologram is recorded when a part of emitted laser beam goes directly to the photographic plate and the other part being object beam is reflected from the object and made to fall on the photographic plate , hence interfering with reference beam to produced an interference  pattern , which is called a hologram. Even the hologram is break into two pieces , single piece produced   the whole image of the body with reduced intensity .


Holography is used for diagnosis in various field of medicine  , non destructive testing , holographic information storage , display device and pattern -matching procedures in credit card and identity card verification . 



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