In the ray diagram shown here, calculate the speed of light in the liquid of unknown refractive index.

Explanation

To calculate the speed of light in the liquid of unknown refractive index, we will follow these steps:

### Step 1: Understand the relationship between refractive index and critical angle
The refractive index \( n \) of a medium can be related to the critical angle \( C \) using the formula:
\[ \sin C = \frac{1}{n} \]
This means that if we know the critical angle, we can find the refractive index.
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