[en] The definition of mesooptics is presented. In the general case n-dimensional object is transformed into (n+1)-or (n+2)-dimensional image. The principle of the Mesooptical Fourier-Microscope, suggeseted for the examination of nuclear interactions in nuclear photoemulsions, used in the experiments in the high energy physics, has been described. Possible methods of data processing in the microscope are briefly discussed. The advantage of the mesooptical systems, as compared with the systems of classical optics, expecially for the point or linear objects, is demonstrated