Find the angle of refraction in a medium `(mu=2)` if light is incident in vacuum, making an angle equal to twice the critical angle.

Explanation

To solve the problem of finding the angle of refraction in a medium with a refractive index (μ) of 2, when light is incident from a vacuum at an angle equal to twice the critical angle, we can follow these steps:

### Step 1: Calculate the Critical Angle
The critical angle (C) can be calculated using the formula:
\[ C = \sin^{-1}\left(\frac{1}{\mu}\right) \]
Given that \(\mu = 2\):
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