Write a relation between the angle of incidence
(i), angle of emergence (e), angle of prism (A) and angle of deviation (d) for a ray of light passing through an equilateral prism.

Explanation

To derive the relation between the angle of incidence (i), angle of emergence (e), angle of prism (A), and angle of deviation (d) for a ray of light passing through an equilateral prism, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Geometry of the Prism**:
- An equilateral prism has three equal angles of 60 degrees each. The angle of the prism (A) is therefore 60 degrees.

2. **Identifying the Angles**:
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