Calculate the refractive index of material with respect to air if its critical angle is `60^@`.

Explanation

To calculate the refractive index of a material with respect to air given its critical angle of \(60^\circ\), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Critical Angle**:
The critical angle (\(C\)) is the angle of incidence above which total internal reflection occurs when light travels from a denser medium to a rarer medium.

2. **Use the Formula for Critical Angle**:
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