Need book on billiard ball type problems

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A request for book recommendations on billiard ball problems involving reflections within polygons is made, specifically excluding art gallery problems. The focus is on scenarios where the walls are mirrors. Participants are encouraged to suggest relevant literature or academic papers on this topic. The discussion emphasizes the need for resources that delve into the mathematical aspects of billiard dynamics. Recommendations for both books and papers are sought to aid in understanding this area of study.
Dragonfall
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I need a book about billiard balls (or light rays) bouncing around the inside of polygons. Any suggestions?

I am not talking about art gallery problems. The walls must be made of mirrors.
 
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Anyone?
 
Dragonfall said:
Anyone?

Or if anyone can refer me to some papers on the subject, that would be nice.
 
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