Which of the following correctly represents the graphical relation between the angle of incidence (i) and angle of reflection (r)?

The correct option is D

1. As per the law of reflection, $\angle i=\angle r$
2. Since y=mx is a graph of a straight line
3. So, if a graph is drawn between the angle of incidence and reflection, it will be a straight line.

Therefore, the correct answer is (D)