- Function need 功能需求 :
Stable, reliable, be able to see objects far and small in the universe.
2. Constrains 设计限制 :
Mirror surface must not distort more than δ under self weight；
High dimensional stability of structure;
Resistant to influence of environmental change;
The error can be compensated.
3. Objective 设计目标 :
Get clear pictures of the universe.
4. Free variables 设计空间 ：
Thickness of mirror and choice of material ;
Mirror support structure；
5. Extended reading:
Giant Magellan Telescope (GMT)
Large Binocular Telescope (LBT)
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