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Here are some numbers for the start:
Sun's output is 1.3kW/m2 (above atmosphere, of course).
Sun's apparent magnitude is -29.
So, star of magnitude 0 has 2.5^29 lowr power flux, which is 0.000000003746994889972252672 W/m2, or 3.7nW/m2
This means, 10" mirror will collect ~0.23nW... very small power indeed, and this will be over the whole spectral bandwidth (so with apsorption in the atmosphere, this will be way below this value).
Now, this is for a star of mag 0.
It all depends how bright eta will be when it goes off :-)
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