Why luminous zone is yellow in colour in a candle flame?

Explanation

**Step-by-Step Solution:**

1. **Understanding Candle Flame Structure**: A candle flame consists of different zones, including the outer zone (non-luminous), the luminous zone (yellow), and the inner zone (blue). Each zone has different characteristics based on the combustion process occurring within it.

**Hint**: Identify the different zones of a candle flame and their characteristics.

2. **Limited Oxygen Supply**: In the luminous zone of the candle flame, the supply of oxygen is limited. This means that not all the wax (fuel) can completely combust because there isn't enough oxygen available.

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