Gregory Galperin is slated to give the Friday colloquium this week. His topic is
A Geometric Problem That Leads to the Billiard Law of Reflection
Abstract:I will show some examples of "invisible geometric objects." This means that light bends around an object, causing it to become as it were invisible. The Billiard Law of Reflection, which states that the angle of reflection equals the angle of incidence, will play a crucial role. The main examples will concern billiard reflection for ellipses and hyperbolas.
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