Snell's Law Calculator

Snell's Law describes how light bends when passing from one medium to another. It states that the ratio of the sines of the angles of incidence and refraction equals the inverse ratio of the refractive indices: n₁ sin(θ₁) = n₂ sin(θ₂).

Total internal reflection occurs when light traveling in a denser medium hits the boundary with a less dense medium at an angle greater than the critical angle. All light is reflected back into the denser medium instead of being refracted.