x-y plane separates two media, `zge0` contains a medium of refractive index 1 and `zle0` contains a medium of refractive index 2. A ray of light is incident from first medium along a vector`hati+hatj-hatk`. Find the unit vector along the refracted ray.

Explanation

To find the unit vector along the refracted ray when a ray of light passes from one medium to another, we can follow these steps:

### Step 1: Define the Incident Ray Vector
The incident ray is given as a vector:
\[ \vec{I} = \hat{i} + \hat{j} - \hat{k} \]

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