A light projector for an augmented reality headset, the light projector comprising: an image generator (4; 104) configured to provide an image with unpolarised light; a polarising beam splitter configured to receive the unpolarised light from the image generator and to split the unpolarised light into a first path and a second path by reflecting linearly polarised light of a first orientation and transmitting linearly polarised light of a second orientation, wherein the first orientation is orthogonal to the second orientation; a first optical arrangement comprising a first concave mirror (12; 112), the first optical arrangement being configured to receive light from the polarising beam splitter in the first path so that the first concave mirror (12; 112) reflects, focuses and directs the light back towards the polarising beam splitter; and a second optical arrangement comprising a second concave mirror (22; 122), the second optical arrangement being configured to receive light from the polarising beam splitter in the second path so that the second concave mirror (22; 122) reflects, focuses and directs the light back towards the polarising beam splitter, wherein the first and second optical arrangements comprise first and second quarter-wave plates respectively so that the light encounters the first and second quarter-wave plates twice in the first and second paths respectively; wherein the polarising beam splitter is configured to receive and combine the light from the first and second optical arrangements so that the combined light, which is unpolarised, is provided to an exit pupil (11; 111), and wherein the first and second optical arrangements are angled relative to one another so that an image from the first path is aligned with an image from the second path. an image generator (4; 104) configured to provide an image with unpolarised light; a polarising beam splitter configured to receive the unpolarised light from the image generator and to split the unpolarised light into a first path and a second path by reflecting linearly polarised light of a first orientation and transmitting linearly polarised light of a second orientation, wherein the first orientation is orthogonal to the second orientation; a first optical arrangement comprising a first concave mirror (12; 112), the first optical arrangement being configured to receive light from the polarising beam splitter in the first path so that the first concave mirror (12; 112) reflects, focuses and directs the light back towards the polarising beam splitter; and a second optical arrangement comprising a second concave mirror (22; 122), the second optical arrangement being configured to receive light from the polarising beam splitter in the second path so that the second concave mirror (22; 122) reflects, focuses and directs the light back towards the polarising beam splitter, wherein the first and second optical arrangements comprise first and second quarter-wave plates respectively so that the light encounters the first and second quarter-wave plates twice in the first and second paths respectively; wherein the polarising beam splitter is configured to receive and combine the light from the first and second optical arrangements so that the combined light, which is unpolarised, is provided to an exit pupil (11; 111), and wherein the first and second optical arrangements are angled relative to one another so that an image from the first path is aligned with an image from the second path. <EOS>