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• 10:10, 12 May 2023 Altilunium talk contribs created page Light (Created page with "Rasmus Bartholin, a member of the Bartholin family which played a dominant role in the University of Copenhagen for about a hundred and fifty years, was a professor of mathematics and medicine there. In 1669, he published his observation of a phenomenon. Studying the transition of a beam from air into a crystal of Icelandic spear, he discovered double refraction. Upon entering that crystal, light suffers not one deflection but two at once, the beam splits into two parts....")