I.A.Yusupov and G.J.Orazimbetova and M.B.Karimboyeva (2024) OPTIK TOLA QO’SHILGAN YORUG'LIK O'TKAZUVCHI BETONNI EKSPERIMENTAL O'RGANISH. INTERNATIONAL JOURNAL OF RECENTLY SCIENTIFIC RESEARCHER'S THEORY, 2 (9). pp. 82-87. ISSN 2992-8885