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Grosseteste’s own practice demonstrates a remarkable indifference to experimental procedure; thus he formulated a general principle of refraction, but he simply assumed that it must, like the law of reflection, involve equal angles, and never conducted the elementary tests which would have shown that this assumption was misplaced.

By contrast, the ancients had known, by our reckoning, only four physical laws: the law of the lever, the optical law of reflection, the law of buoyancy and the parallelogram law of velocities.16 Or, rather, the ancients had known four principles that we call laws.

There's a principle in physics known as the law of reflection.

The behavior of the light as it reflects would follow a predictable "law" known as the "law of reflection."

The law of reflection states that when a ray of light reflects off a surface, the angle of incidence or the angle of approach so to speak is equal to the angle of reflection.