Snell’s Law Calculator
Find the angle of refraction.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator solves Snell's law, n₁ sin θ₁ = n₂ sin θ₂, to find the angle a light ray bends when it crosses the boundary between two materials with different refractive indices. Enter the incident angle and the two indices of refraction to get the refraction angle.
Optics students use it to work through textbook problems on lenses and prisms, while engineers use the same relationship to design camera lenses, eyeglasses, optical fibers, and anti-reflective coatings. It also flags total internal reflection when no real refraction angle exists.
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