An optical relay device (10), comprising a light-transmissive substrate shaped as a structure (14) having an apex section (141), a right section (142) and a left section (143) being separated from the right section by an air gap (144). The optical relay device further comprises at least two input optical elements (13a, 13b) located at the apex section, a right output optical element (19) located at the right section and a left output optical element located at the left section (15). The substrate and the optical elements are designed and constructed such that light is redirected by the input optical elements, propagates via total internal reflection in the direction of at least one of the sections, and redirected out of the substrate by at least one output optical element.
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