take the object and apply a blinn material and change its color to black. set the eccentricity to .207 and set the spec. roll off to 1.587
set spec. color to white
and reflectivity to 1.

go down to raytrace options in the material and set reflection limit to 10 and reflection spec. to 1.


now go into the render settings window. change edge anti-aliasing to highest quality just so you can see the result better and in the raytracing tab, set reflections all the way to 10.


hit render, and you now have a mirror!


if you are confused at all please inform me and i will make myself more clear.