• Jul 31, 2025 snell s law problems zerobio Mathematically, it is expressed as: nâ sin θâ = nâ sin θâ Where: nâ and nâ are the refractive indices of the first and second media, respectively. θâ and θâ are the angles of incidence and refraction measured relative to the normal. The Significance of Snell's Law in Optics Underst By Christina Gislason