Final answer:
Reflection of light over two perpendicular mirrors adheres to the Law of Reflection, leading the outgoing ray to be parallel to the incoming ray. This is due to two right-angle reflections causing a total rotation of 180 degrees. For a coordinate reflection over the line y=2, the y-coordinate of a point is adjusted while the x-coordinate remains unchanged.
Step-by-step explanation:
Reflecting light over two mirrors at a right angle involves the Law of Reflection, which states that the angle of incidence (èi) is equal to the angle of reflection (èr). When a ray of light hits the first mirror, it reflects off at an angle equal to its angle of incidence. Upon striking the second mirror, which is perpendicular to the first, it reflects again, making the outgoing ray parallel to the incoming ray. This occurs because the two right angle reflections collectively rotate the direction of the light ray by 180 degrees.
For a reflection over the line y = 2, each point on the graph is reflected across this horizontal line. The transformation of a point (x, y) to its reflected point can be described in coordinate notation as (x', y') = (x, 2 + (2 - y)), which signifies that the x-coordinate remains the same while the y-coordinate is adjusted based on its distance from the line y = 2.