The statement describes Snell's Law, which governs how light bends when passing between different media. It states that the ratio of the sine of the angle of incidence (θ₁) to the sine of the angle of refraction (θ₂) is equal to a constant, the refractive index (n).

Mathematically, it is expressed as: $\frac{\sin \left({\theta }_1\right)}{\sin \left({\theta }_2\right)}=n$

Final Answer: Snell’s law.