Two mirrors are arranged as shown in the drawing. Light is incident from the right on the first mirror at an angle of 70°. The light reflects toward the second mirror and is reflected at angle θ. Determine the angle θ. I know that the angle of incidence is equal to the angle of reflection. My problem is that its been many years since I have taken geometry and I am very rusty. If you can solve this, please show your work. Much appreciated.