Hoang, T., nguyen, H., nguyen, thu and nguyen, linh 2023. Design the compact dual FOV infrared optical system for the application in a mixed day and night observation equipment. Journal of Military Science and Technology. 89, 89 (Aug. 2023), 117–123. DOI:https://doi.org/10.54939/1859-1043.j.mst.89.2023.117-123.