File:PSM V11 D682 Experiment showing the law of refraction.jpg
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current | 02:15, 28 July 2010 | 1,188 × 1,205 (439 KB) | Ineuw | {{Information |Description = Experiment showing the law of refraction |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_11.djvu/682 |Date = 1877 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} {{GFDL-user-w |
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