Have you ever noticed the patterns of light reflected from a glass of water or a cup of coffee?

Image adopted from Wikipedia with permission of GNU; created by Heiner Otterstedt.
 

Image adopted from Wikipedia with permission of Creative Commons; created by Gérard Janot.

The following is an applet  for analyzing the curves often seen on the surface of coffee.

Dr. Sabine Segre
Davidson Institute of Science Education
 
 
A note to the reader
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