Luminous device (2; 302, 302', 302"), in particular for a motor vehicle, comprising: - a first light source (4; 304) and a second light source (14; 314) that are each able to emit light rays; - a first collector (6; 306) and a second collector (16; 316) each with a concave reflective surface (6.2, 16.2; 306.2, 316.2) configured to collect and reflect the light rays emitted by the first light source (4; 304) and the second light source (14; 314), respectively; - an optical system (10, 10'; 310, 310', 310") configured to project the light rays reflected by the reflective surfaces (6.2, 16.2; 306.2, 316.2) of the first collector (6; 306) and of the second collector (16; 316), respectively, into a first light beam (12; 312) and into a second light beam (18; 318) along an optical axis of the device (8; 308); the optical system (10, 10'; 310, 310', 310") being configured to form a luminous image of the reflective surface (6.2, 16.2; 306.2, 316.2) of each of the first collector (6; 306) and second collector (16; 316), the reflective surfaces (6.2, 16.2; 306.2, 316.2) having, with respect to a general direction of propagation of the corresponding light beam, a front edge (6.2.1; 16.2.1) and a rear edge (6.2.2; 16.2.2), said edges bounding in opposite directions the corresponding luminous image, and each of the first light beam (12; 312) and second light beam (18; 318) forming a portion or the entirety of a lighting or signalling function that is distinct from the lighting or signalling function of the other of said first and second beams, characterized in that - the optical system (10, 10'; 310, 310', 310") has a first focal point (10.5; 310.5) located axially behind a front limit of the reflective surface (6.2; 306.2) of the first collector (6; 306), and a second focal point (10.6; 310.6) located axially behind a front limit of the reflective surface (16.2; 316.2) of the second collector (16; 316); and - the first focal point (10.5; 310.5) of the optical system is located in proximity to the rear edge (6.2.2) of the reflective surface (6.2; 306.2) of the first collector (6; 306) and the second focal point (10.6; 310.6) of the optical system is located in proximity to the rear edge (16.2.2) of the reflective surface (16.2; 316.2) of the second collector (16; 316). - a first light source (4; 304) and a second light source (14; 314) that are each able to emit light rays; - a first collector (6; 306) and a second collector (16; 316) each with a concave reflective surface (6.2, 16.2; 306.2, 316.2) configured to collect and reflect the light rays emitted by the first light source (4; 304) and the second light source (14; 314), respectively; - an optical system (10, 10'; 310, 310', 310") configured to project the light rays reflected by the reflective surfaces (6.2, 16.2; 306.2, 316.2) of the first collector (6; 306) and of the second collector (16; 316), respectively, into a first light beam (12; 312) and into a second light beam (18; 318) along an optical axis of the device (8; 308); the optical system (10, 10'; 310, 310', 310") being configured to form a luminous image of the reflective surface (6.2, 16.2; 306.2, 316.2) of each of the first collector (6; 306) and second collector (16; 316), the reflective surfaces (6.2, 16.2; 306.2, 316.2) having, with respect to a general direction of propagation of the corresponding light beam, a front edge (6.2.1; 16.2.1) and a rear edge (6.2.2; 16.2.2), said edges bounding in opposite directions the corresponding luminous image, and each of the first light beam (12; 312) and second light beam (18; 318) forming a portion or the entirety of a lighting or signalling function that is distinct from the lighting or signalling function of the other of said first and second beams, characterized in that - the optical system (10, 10'; 310, 310', 310") has a first focal point (10.5; 310.5) located axially behind a front limit of the reflective surface (6.2; 306.2) of the first collector (6; 306), and a second focal point (10.6; 310.6) located axially behind a front limit of the reflective surface (16.2; 316.2) of the second collector (16; 316); and - the first focal point (10.5; 310.5) of the optical system is located in proximity to the rear edge (6.2.2) of the reflective surface (6.2; 306.2) of the first collector (6; 306) and the second focal point (10.6; 310.6) of the optical system is located in proximity to the rear edge (16.2.2) of the reflective surface (16.2; 316.2) of the second collector (16; 316). - the optical system (10, 10'; 310, 310', 310") has a first focal point (10.5; 310.5) located axially behind a front limit of the reflective surface (6.2; 306.2) of the first collector (6; 306), and a second focal point (10.6; 310.6) located axially behind a front limit of the reflective surface (16.2; 316.2) of the second collector (16; 316); and - the first focal point (10.5; 310.5) of the optical system is located in proximity to the rear edge (6.2.2) of the reflective surface (6.2; 306.2) of the first collector (6; 306) and the second focal point (10.6; 310.6) of the optical system is located in proximity to the rear edge (16.2.2) of the reflective surface (16.2; 316.2) of the second collector (16; 316).