Article misses the big question: why did they put all this work into developing ... | Hacker News

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		propter_hoc on Sept 28, 2019 \| parent \| context \| favorite \| on: World's largest optical lens is 5.1 feet wide and ... Article misses the big question: why did they put all this work into developing a solid lens rather than a mirror or a Fresnel lens?

woodandsteel on Sept 28, 2019 [–]

My guess is a mirror wouldn't fit into the design, and a Fresnel lens would not have the needed accuracy for astronomical work.

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