Law of reflection

The law of reflection states that when a light wave or ray hits a reflective surface, like a mirror, the angle at which it arrives (called the incident angle) equals the angle at which it bounces off (called the reflected angle). Both angles are measured relative to the perpendicular line (the normal) drawn at the point of contact. This rule ensures that the path of the reflected light is predictable: if you know the direction of incoming light, you can determine exactly where it will reflect. It applies to all types of waves, including light, sound, and water waves.