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| When does Snell's Law fail? |
during TIR at critical angle at i=r at i=0 |
| at i=0 |
| At normal incidence, i=0 and the ray passes undeflected i.e. angle of refraction = 0. This implies, sin r tends to zero. The refractive index approaches infinity which is not possible as it should be a finite constant. |
