You can buy some on amazon for $10 https://www.amazon.com/Copernicus-CCTV-TV-Rock-Ulexite/dp/B002FPF9H2 …
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Here’s a nice kit of fiber optics experimentshttps://www.arborsci.com/products/adventures-in-fiber-optics-kit …
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Here’s the experiments manual. Reading it was illuminating. https://asc-mag-media.s3.amazonaws.com/datasheet/Adventures_FO.pdf …
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