critical angle

Question

Critical angle c satisfies sin c =:

RankGuru · Accepted Answer

**Critical Angle ($c$)** is the angle of incidence in a denser medium such that the angle of refraction in the rarer medium is $90^\circ$.
- From Snell's Law: $n_1 \sin c = n_2 \sin 90^\circ$
- $\sin c = \frac{n_2}{n_1}$
- If the angle of incidence exceeds $c$, light is completely reflected back into the denser medium (**Total Internal Reflection**).

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