Why there is no interference pattern observed when two coherent sources are placed far apart?

Explanation

### Step-by-Step Solution:

1. **Understanding Coherent Sources**:
- Coherent sources are two or more sources that emit waves with a constant phase difference. For interference to occur, these sources must maintain this coherence.

2. **Interference Pattern Formation**:
- An interference pattern is formed when two coherent waves overlap. This pattern consists of alternating bright (maxima) and dark (minima) fringes on a screen.

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