Posted by Tom on Sunday, March 9, 2008 at 12:17am.
Find the distance light travels from its starting point, S to its final point, F by traveling two different paths: Reflecting from point A, and reflecting from point B.
From point S to A is 30 cm, from point A to B is 30 cm, from point B to F is 30 cm, and from the mirror to point F is 30 cm.

Physics  drwls, Sunday, March 9, 2008 at 5:09am
I am not able to visualize this from your description. Your question may go unanswered, unless someone else can figure out where the points are in one or two dimensions.

Physics  Tom, Monday, March 10, 2008 at 12:19am
S +\ + /+F
+ \ + / +
30cm+ \ + / +30cm
+ \ + / +
+ \+/+mirror
A 30cm B 30cm
a^2 = b^2 = c^2
I don't know where to go from here

Physics  Tom, Monday, March 10, 2008 at 12:27am
the diagram I drew looked nothing like that.The mirror is on the bottom, and B is in the middle, and A is on the left bottom corner. S is on the upper left corner, and F is on the upper right corner. There's 30 cm between each point. There's some triangles.
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