Bubbles of colourless soap solution appear coloured in sun light. Why ?
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**Step-by-Step Solution:**
1. **Understanding the Phenomenon**: The question asks why colorless soap bubbles appear colored when illuminated by sunlight. The key concept here is the interaction of light with the soap bubble.
2. **Nature of Soap Bubbles**: Soap bubbles are thin films of liquid (soap solution) that trap air inside. The thickness of these films can vary, which plays a crucial role in how light interacts with them.
3. **Interference of Light**: When light hits the surface of the soap bubble, some of it is reflected off the top surface of the bubble, while some penetrates the bubble and is reflected off the inner surface. This leads to two sets of light waves that can interfere with each other.
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