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How thick is the gold layer over the beryllium? I'm guessing that there was some thought put into accounting for micro-impacts and how they would effect performance.
Thinner than a human hair! (~1000 Angstroms in thickness). More here: https://www.jwst.nasa.gov/content/observatory/ote/mirrors/index.html#5 … As for micrometeoroids, tests showed a negligible impact on the mirrors: https://jwst.nasa.gov/content/about/faqs/faq.html#micro …
Thanks @NASAWebb!
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