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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.
n₁ sin θ₁ = n₂ sin θ₂
Light changes direction at a boundary because its speed changes; the angles are measured from the normal line.
Refracted angle
… °
The calculation runs entirely in your browser, no data leaves your device. Change any number and the answer updates instantly.