Write the law of reflection of a light beam from a mirror in vector from, using the directing unit vectors `e` and `e'` of the incident and reflected beams and the unit vector `n` of the outside normal to the mirror surrfcae.

Explanation

To express the law of reflection in vector form using the unit vectors of the incident beam \( \mathbf{e} \), the reflected beam \( \mathbf{e}' \), and the unit normal vector \( \mathbf{n} \) to the mirror surface, we can follow these steps:

### Step-by-Step Solution:

1. **Define the Incident and Reflected Vectors**:
- Let \( \mathbf{e} \) be the unit vector in the direction of the incident beam.
- Let \( \mathbf{e}' \) be the unit vector in the direction of the reflected beam.
- Let \( \mathbf{n} \) be the unit normal vector to the surface of the mirror.
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