Snell's Law Calculator

Find the angle of refraction using Snell's Law.

Calculate

Formula

Enter next fieldEsc clear

Formulas

n1 × sin(θ1) = n2 × sin(θ2)

Refractive indices: Air=1.0, Water=1.33, Glass=1.5, Diamond=2.42

Snell's Law

Describes how light bends when passing between materials with different refractive indices. Total internal reflection occurs when angle exceeds the critical angle (light stays in denser medium).