The ordinary photograph gives exactly a two dimensional impression of the picture. Because camera lens can be focused exclusively in a particular plane and each(prenominal) other planes are out of focus. The photo graph records only the intensity in that plane. Gabor in 1947 suggested a distinguishable photographic technique using coherent silly and wave bm reconstruction. With the advent of lasers, Lieth and Upatnicks in 1962 revised Gabors idea in photography. The technique is now known as HOLOGRAPHY (Holo stands for whole and Graphy direction writing, i.e., complete recording). This is a technique for recording and reproduction an determine of the fair game without the use of lenses. This records not only the amplitude(intensity) but as well the phases of light received from different parts of the 3D object. This is ground on the phenomenon of INTERFERENCE.
Def: It is a technique for recording and reproducing an image of an object without the use of lenses. The technique is called Wave front reconstruction. This records not only the amplitude (intensity) but also the phases of light received from different parts of the three dimensional object.
Procedure: In holography, the image of the object to be photographed is not recorded but the light waves reflected from the object are recorded. The photographic record is called a hologram.
It bind no resembles with the object. It contains information about the object in the merciful of optical code. When the hologram is illuminated by coherent stock of light, a 3D image of the original object is formed. Hence, holography is a two-step processes. (i)Transformation of the object into hologram and (ii) Retransformation or reconstruction of hologram into the image of the object.
Principle: When light waves are reflected from the object, they are chacterised by their amplitude and phase. When light is incident on a commove object, the reflected wavefronts are spherical with centre at the point object. instantaneously light is incident on a solid(infinite number of...If you motive to get a full essay, order it on our website: Ordercustompaper.com
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