# Refractive index of glass block (Snells law)

17/12/2009 14:22

**To verify Snell's law. To find the refractive index of a glass block.**

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**Formula: n = sin i/ sin r. **

**Errors: **Measurement of angles only as accurate a protractor.

**Accuracy: **If the angle of incidence is made larger then the refracted angle becomes larger, reducing percentage error of the protractor.