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It is shown thatl ight, initially linearly polarized, becomes endowed with elliptical polarisation on traversal of an antiferromagnetic crystal acted on by a static magnetic field (induction B). The ellipticity can be linear in B, thus being the Magnetic Analog of Pockels' Effect (MAPE). The MAPE is sensitive to the magnetic crystal symmetry and to reorientation of the antiferromagnetic vector. Moreover, it undergoes a change in sign when the direction of the magnetic moments of a sublattice are inverted. Owing to this MAPE can be used to study the time-reversed domain structure of antiferromagnets, to determine the symmetry of magnetic ordering, and to study the magnetic crystal energy spectra by spectroscopy methods.