At the Institute of Applied Problems of Physics, events are held on that day aimed at… 1.to present the applications of light and radiation in current problems of physics and materials science. 2.to present the latest research of the institute’s laboratories in the fields of optics, laser physics, and radiation physics. 3.to encourage young scientists and students to take an interest in light-based technologies and their applications. 4.to demonstrate how light-related research becomes important in medicine, energy, information technology, and industry.