Can you solve this pier puzzle?

I solved it simply assuming we are on a 2-d plane. Plus knowing this channels content, I connected this problem to something I learned in geometric optics about light. When deflected, light will take the shortest path. You simply reflect point a and point b over an axis and draw a diagonal from point a to point b prime. Then take the part of the line that goes at point c (assuming point c is the median of said axis between points a and b) and reflect the line going to point c to point b prime to the new line now touches points c and b. This honestly wasn't hard to me and enjoyed this little reminder of geometry and optics. I hope we do more of these puzzles.