Critical Angle

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Critical angle c for medium (n) to air (n≈1) satisfies?

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1. **Condition for Critical Angle**: Light must travel from a denser medium ($n_1 = n$) to a rarer medium ($n_2 = 1$).
2. **Definition**: The critical angle ($c$) is the angle of incidence for which the angle of refraction is exactly $90^\circ$.
3. **Application of Snell's Law**: $n_1 \sin 	heta_1 = n_2 \sin 	heta_2$.
4. **Substitution**:
   - $n \sin c = (1) 	imes \sin 90^\circ$
   - $n \sin c = 1$
5. **Rearrange**: **$\sin c = \frac{1}{n}$**.
6. **Significance**: For any angle $	heta > c$, Total Internal Reflection occurs.

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Critical Angle

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Critical angle c satisfies sin c =:

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