Demonstration of the Snell's Law , Northwestern University, USA.
Biography of Willebrord van Roijen Snell , University of St. Andrews, Scotland.
Circles of Light: The Mathematics of Rainbows , University of Minnesota, USA.
Snell's Law from the "The Joy of Visual Perception: A Web Book" by Peter K.Kaiser at York University, Canada.
Pacific Northwest United States Sesmicity for the past 30 days from the University of Washington.
Reflection and Refraction from the University of New Brunswick, Canada course in Physics 1940.
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