Monoclinic optically active absorbing crystals of class 2

The article contains results of the research based on the scientific ideas and results of academician B.V. Bokut which were obtained using covariant methods of F.I. Fedorov. Results of the study of monoclinic optically active absorbing crystals of class 2 are presented. Comparison with rhombic crystals of class 222 is made. Peculiarities of polarization of eigenwaves near optical axes in crystals such as transparent optically active, absorbing, optically active and absorbing are consecutively considered. Dependencies of the azimuth of polarization of transmitted light with the incidence angle equal to zero are presented for these cases. Two cases for monoclinic crystals are considered. The first case is when there is absorption and symmetric axis number 2 lies in the same plane as optical axes and the second case is when axis number 2 is perpendicular to the optical axes. The main peculiarities are noticed when axis number 2 is perpendicular to the optical axes.