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Snell's Law Calculator
Enter two materials' refractive indices and an angle of incidence to calculate the refraction angle.
How to use this tool
- 1Choose the material light is coming from.
- 2Choose the material light is entering.
- 3Enter the angle of incidence.
- 4See the refraction angle.
Frequently asked questions
What is total internal reflection?+
When light tries to pass into a less-dense material at too steep an angle, no refraction is mathematically possible and the light fully reflects instead — this tool flags that case explicitly.
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