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September 19th, 2014, 10:54 PM  #1 
Newbie Joined: Sep 2014 From: bhubaneswar Posts: 1 Thanks: 0  get angle after n reflection inside a square
Is there a general formula that tell what angle a line will make on the side of a square after it makes n reflection on the sides of the square. Provided the first angle it make on one side of the square at a certain point. It is sure after n reflection, the line is going to make a certain angle at a certain point at a certain side of the square. What I know, how a computer find the above, is by calculating each reflection and arriving at the n reflection. Thanks. 
September 20th, 2014, 03:11 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,821 Thanks: 723 
At each collision the angle of incldence equals the angle of reflection. If the next collision is with a perpendicular wall, the angle is the complement. If the next collision is with the parallel wall, the angle is the same. The computer problem is then determining which wall is hit after n collisions. This is a somewhat messy, but straightforward geometry calculation. 

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angle, inside, reflection, square 
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