# Ellipse: Reflective Property

The applet below contains an ellipse with both its foci shown.

**Feel free to place point**How would you describe the phenomena you see?*P,*the orange point, and both foci of the ellipse anywhere you'd like at any time!*Do a little exploratory research on the following topics: Specifically, how are ellipses used in each application?*

**1) Whispering Galleries 2) Elliptic Lithotripsy (Destroying Kidney Stones)**

**How is the principle illustrated in the applet above "reflected" (no pun intended) in each of these applications?**

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