English: Diagram of three types of reflector (reflex) sights. The top uses a collimating lens (CL) and a beam splitter (B) to create a virtual image at infinity (V) of a reticule (R). The bottom two use half silvered curved mirrors (CM) as the collimating optics.
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Partially adapted from File:Red dot sight principle.png (is/was here) by User:Fluzwup, an image released to the public domain.
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