Speed of light in a liquid is `1.8 xx 10^(8)` m/s. What is the critical angle for the liquid air pair?

Explanation

To find the critical angle for the liquid-air pair, we can follow these steps:

### Step 1: Understand the relationship between speed of light and refractive index
The refractive index (μ) of a medium is defined as the ratio of the speed of light in vacuum (or air, denoted as \(c\)) to the speed of light in the medium (denoted as \(v\)):
\[ \mu = \frac{c}{v} \]

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