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Mathematically, it is expressed as: n₁ sin θ₁ = n₂ sin θ₂ Where: n₁ and n₂ are the refractive indices of the first and second media, respectively. θ₁ and θ₂ are the angles of incidence and refraction measured relative to the normal. The Significance of Snell's Law in Optics Underst