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| Reflection from a flat mirror
| align="center" | <math> \begin{pmatrix} -1 & 0 \\ 0 & 1 \end{pmatrix} </math><ref>{{cite book |last1=Hecht |first1=Eugene |title=Optics |date=2002 |publisher=Addision Wesley |edition=4}}</ref>
| Valid for flat mirrors oriented at any angle to the incoming beam. Both the ray and the optic axis are reflected equally, so there is no net change in slope or position.
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