15_ Consider a mirror lying along the :raxis in R2. A laser starts at the point (2, 6) and is red in the direction of (4, 3). The beam travels until it hits the mirror, where it reects off the mirror and then travels until it hits a wall on the line a: = 20. (a) Give a parametrization for the initial path of the laser. (b) At What point does this beam hit the mirror? (c) Give a parametrization for the path of the reected beam. ((1) At What point does this beam hit the wall