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Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc.
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How does that design help if the lens is ground wrong?
You mean the big mirror segments? If they grind those wrong it's done so let's hope they didn't screw up. They know they can't fix it and are well aware of what happened to hubble so I'd bet this design will have gone through a lot more tests than hubble did. I'm sure advances in instrumentation technology and computer modeling haven't hurt either.
Plus aren't the mirrors individually adjustable to "correct" for any potential issues? As I understand it there are 16 segments, each with a mount, motor, etc.
Another level of redundancy comes in with the mirror deployment. The mirror at full width won't fit in the launch vehicle:
Because of this six of the mirror segments fold off to the side and are rotated into place after launch:
If something happens where three or six of the mirrors can't rotate into place the telescope will still be functional with a decreased light gathering power.