It has been observed that in case of an imaging geometry, the speckle size and shape depend upon the aberrations, provided the scattering spot size is smaller than the point-spread function of the optical system. In the presence of spherical aberration the speckle pattern becomes radially streaky. Photographs of the patterns at paraxial, marginal, least-confusion, and defocused planes are given. When the diffuser is given a translatory motion the speckle at a point in the observation plane moves along the shadow of a knife edge (with its edge parallel to the direction of translation) placed at a suitable position in the pupil plane. Experiments with the atropinized eye also yielded the same results. A heuristic explanation for these results is included.
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