Hologram, three dimensional images, which actually looks
like real object. Basically, in photography it is not possible. Holography is
all about storage of image including intensity and phase difference of all
points of object and further formatting it in accordance with its record.
But conclusively what we have learned is insufficient. We
have studied the theory but haven’t ever thought do it practically. The problem
is that reconstruction of image seems non-feasible because in order to view 3D
image the ray has to stop propagating at some distance. In the similar way all
the rays from object or source must form a plane in space. Here arise a problem
that how can ray be stopped traveling at some distance. What if all of sudden
medium changes while propagation of light? If it happens then some light
refracts while some reflects and we will be able to watch where the light has
reflect. If now bulk of rays together bend then we will be able to see line,
plane and even object.
We have seen concept of how to discover an image but how
medium can be possibly changed. Here is the solution. The path through which
the light propagate, from its lateral side, beam of radiation is sent from transmitter
to receiver, which is on the opposite side parallel to it. Due to the
radiation, the property of air interferes and thus light may divert from
original path. The figure below makes it
clear.
AO=ray of light from source
BO=reflected ray
XO=refracted or absorbed ray
At ‘O’ ray of light can be seen distinctly. For a ray of
light, a point, for a beam and a bulk of light, object can be discovered.