Any convex mirror would do [1],[7] [1] https://www.ebay.com/itm/10cm-Diameter-Fo... | Hacker News

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grugagag on July 12, 2020 | parent | context | favorite | on: Scientists say you can cancel the noise but keep y...

Any convex mirror would do [1],[7]

[1] https://www.ebay.com/itm/10cm-Diameter-Focal-Convex-Mirror-L...

[7] https://www.amazon.com/Computer-Rear-View-Personal-Security-...

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