Final answer:
The relationship between the incident ray and the reflected ray in the reflection of water waves moving perpendicular to a barrier follows the law of reflection, which states that the angle of incidence is equal to the angle of reflection.
Step-by-step explanation:
The relationship between the incident ray and the reflected ray in the reflection of water waves moving perpendicular to a barrier follows the law of reflection. According to the law of reflection, the angle of incidence is equal to the angle of reflection. This means that the incident ray and the reflected ray are at the same angle with respect to the perpendicular to the barrier.