When a ray of light strikes a reflective surface, it reflects according to the law of reflection, which states that the angle of incidence is equal to the angle of reflection. This means that the angle formed between the incoming ray and the normal (a perpendicular line to the surface at the point of incidence) is the same as the angle formed between the reflected ray and the normal. The direction of the reflected ray is determined by this relationship, resulting in a predictable change in the light's path.
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