Asymmetric turning film with multiple light sources

An optical system, comprising:

• a first light source and a second light source having differently oriented light distributions;
• an asymmetric turning film comprising a first major surface and a second major surface, wherein the first major surface is substantially smooth and the second major surface comprises a plurality of identical microstructures each comprising a first face having a first shape and a second face having a different second shape;
• and
• a polarizer;
• wherein light from the first light source is preferentially reflected by the first face but not the second face, and is transmitted through the second face;
• wherein light from the second light source is preferentially reflected by the second face but not the first face, and is transmitted through the first face;
• wherein the asymmetric turning film is laminated to the polarizer;
• and wherein the first shape is substantially flat and the second shape is substantially curved.