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The Lens That Saved A Million Ships


The Lens That Saved A Million Ships
In the 1820s, Augustin Fresnel invented a new kind of lens and installed it in France's Cordouan lighthouse. Suddenly, one lamp could light the way for sailors many miles out to sea.

June 21, 2019 at 06:25PM
Continue: https://bbc.in/31PAkLN

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