Use Huygens's principle to explain the formation of diffraction pattern due to a single slit illuminated by a monochromatic source of light.
When the width of the slit is made double the original width, how would this affect the size and intensity of the central diffraction band ?

Explanation

### Step-by-Step Solution:

1. **Understanding Huygens's Principle**:
Huygens's principle states that every point on a wavefront can be considered as a source of secondary wavelets that spread out in all directions. The new wavefront is formed by the envelope of these secondary wavelets.

**Hint**: Recall that Huygens's principle is fundamental in wave theory and helps in understanding wave propagation.

2. **Setup of the Experiment**:
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