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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13997071

Light emitted by Röntgen Ray Tubes, reflected using a concave mirror: the word "concave mirror". Photoprint from radiograph, by James Wimshurst, 1898.

Original public domain image from Wellcome Collection

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Light emitted by Röntgen Ray Tubes, reflected using a concave mirror: the word "concave mirror". Photoprint from radiograph, by James Wimshurst, 1898.

More