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Snell's law (refraction)

θ₂ = 18.79 °

sin⁡θ2sin⁡θ1=c2c1,θc=arcsin⁡(c1/c2)\frac{\sin\theta_2}{\sin\theta_1}=\frac{c_2}{c_1},\quad \theta_c=\arcsin(c_1/c_2)

sin θ₂ / sin θ₁ = c₂ / c₁. Critical angle when θ₂ = 90°.

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