An optical waveguide comprising: a light-transmissive substrate that includes a plurality of internally reflective surfaces (134, 135) to enable light rays of a plurality of different colors to propagate through the substrate by total internal reflection, the substrate having an input light transmission surface and an output light transmission surface; an input surface to receive input light rays of the plurality of different colors from an entry pupil of the optical waveguide; a first wedge-shaped prism to correct chromatic displacements of the light rays, the first wedge-shaped prism having a first outer surface corresponding to the input surface of the waveguide, and having a second outer surface physically and optically coupled with the input light transmission surface of the substrate; and an output surface to output light rays of the plurality of different colors from the substrate through an exit pupil of the optical waveguide; wherein the output surface is parallel to the input surface; wherein the input surface and the output surface are oriented at oblique angles relative to the plurality of internally reflective surfaces (134, 135); wherein the second outer surface of the first wedge-shaped prism and the input light transmission surface of the substrate are oriented at a second oblique angle relative to the plurality of internally reflective surfaces; wherein the input light rays and the output light rays propagate along a same direction that is parallel to the internally reflective surfaces (134, 135); and wherein the optical waveguide has optical properties such that the entry pupil and exit pupil have substantially identical size and shape and such that the input light rays and output light rays have substantially identical chromatic properties. a light-transmissive substrate that includes a plurality of internally reflective surfaces (134, 135) to enable light rays of a plurality of different colors to propagate through the substrate by total internal reflection, the substrate having an input light transmission surface and an output light transmission surface; an input surface to receive input light rays of the plurality of different colors from an entry pupil of the optical waveguide; a first wedge-shaped prism to correct chromatic displacements of the light rays, the first wedge-shaped prism having a first outer surface corresponding to the input surface of the waveguide, and having a second outer surface physically and optically coupled with the input light transmission surface of the substrate; and an output surface to output light rays of the plurality of different colors from the substrate through an exit pupil of the optical waveguide; wherein the output surface is parallel to the input surface; wherein the input surface and the output surface are oriented at oblique angles relative to the plurality of internally reflective surfaces (134, 135); wherein the second outer surface of the first wedge-shaped prism and the input light transmission surface of the substrate are oriented at a second oblique angle relative to the plurality of internally reflective surfaces; wherein the input light rays and the output light rays propagate along a same direction that is parallel to the internally reflective surfaces (134, 135); and wherein the optical waveguide has optical properties such that the entry pupil and exit pupil have substantially identical size and shape and such that the input light rays and output light rays have substantially identical chromatic properties.