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"content": "#OTD in 1822.\n\nFrench physicist Augustin-Jean Fresnel, in a \"note\" read to the Academy of Sciences, reports a direct refraction experiment verifying David Brewster's hypothesis that photoelasticity (as it is now known) is stress-induced birefringence.\n\nhttps://en.wikipedia.org/wiki/Birefringence\n\n#science #physics #optics\nhttps://files.mastodon.social/media_attachments/files/113/146/595/992/067/876/original/59afcb2122386200.jpg\n",
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