Critical Angle and TIR
Glass to Air and Air to Glass
- If you use Snell's Law to get the reflective index of Glass to Air, then the reflective index of Air to Glass will be the reciprocal of the former.
The equation for critical angle
\[\sin\theta_{c}=\frac{n^2}{n^1}$$
$$n_{1}\sin\theta_{1}=n_{2}\sin\theta_{2}\]
TIR = Total Internal Reflection