The proper way to achieve this is to use the mirror reflection shader available here:
http://wiki.unity3d.com/index.php/MirrorReflection4
However this new version targeting Unity 5 is giving me a 'could not find entry point' error. It used to work fine in Unity 4 so it's either a bug or may be I'm missing something. Right now my workaround is to use the 'Fx/Water' shader instead from the standard assets.
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