Calculate the angle of refraction when light passes between two media using Snell's law. Supports any pair of refractive indices and detects total internal reflection.
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Refractive index of the first medium (e.g. air ~ 1.00).
Angle measured from the normal to the surface.
Refractive index of the second medium (e.g. glass ~ 1.50).
How this calculator works
Snell's law relates the angles of incidence and refraction to the refractive indices of two media. Total internal reflection occurs when sin theta2 > 1.
Common questions about this calculator
These calculators are for educational and informational purposes only. While we strive for accuracy, results should be verified for critical applications. Always consult authoritative sources for engineering or scientific work.
