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Snell's Law Calculator
Work out how a light ray bends when it crosses between two materials, or find the unknown refractive index of a material.
nβ sin ΞΈβ = nβ sin ΞΈβ
Light changes direction at a boundary because its speed changes; the angles are measured from the normal line.
Refracted angle
β Β°
The calculation runs entirely in your browser β no data leaves your device. Change any number and the answer updates instantly.