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How big would a telescopes mirror need to be to see close exoplanets?
As in to be able to see the surface.
If you do some simple maths you will find that in order to see exoplanets out to 10LY with the same clarity that Hubble sees the surface of Pluto would require a telescope with a mirror about 60kilometers in diameter.
(Hint: Hubble has a 2.4metre mirror, Pluto is 30AU away at perihelion, and there's about 64,000 AU in a LY).
The Pluto images are vague and needed a lot of processing. Realistically you would need a mirror that could resolve at least an order of magnitude better or more. So you would be looking at an optical system with a diameter of around 600kilometers.
Cheers!
My Chemical Romance - Honey This Mirror Isn't Big Enough...