Snell's Law & Refraction Calculator
Applies Snell's law to find the refracted angle when light crosses between two media, plus the critical angle and whether total internal reflection occurs.
Read the full guide to this tool
Results
Notes
- n₁·sinθ₁ = n₂·sinθ₂: light bends toward the normal when it enters a slower (denser) medium.
- Going into a less dense medium there is a critical angle beyond which all light reflects internally, the effect that makes optical fibres work.
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