On May 28 at 1:00 p.m., a guest lecture "Inverse Problems of Optical Diffraction on 3-D Structures" was held by the stakeholder of the educational scientific program 105 Applied Physics and Nanomaterials (third scientific and educational level) Prof. Dr. of Physics and Mathematics Tyurin Oleksandr Valentynovych (I. I. Mechnikov Odesa National University). The lecture was attended by second-year graduate students. The content of the lecture "Inverse Problems of Optical Diffraction on 3-D Structures" was relevant to the discipline "Inverse Problems of X-ray and Neutron Diffraction", which is taught in the second semester to second-year graduate students, and can also be useful when conducting research on the properties of nanostructures. At the end of the lecture, Professor Tyurin O. V. answered numerous questions from the audience.