If you have unity pro you could use a segond camera that render a texture and use this
texture to make the mirror.
http://docs.unity3d.com/Manual/class-RenderTexture.html
But for free it's not so easy.. you could use something similar
to indie effect (i suppose) but this is slower and could affect your fps..
http://forum.unity3d.com/threads/indieeffects-bringing-almost-aaa-quality-post-process-fx-to-unity-indie.198568/
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