I think having three diagrams side by side might do it:

1. The case where \(\displaystyle W < \lambda\);
2. The case where \(\displaystyle W \approx \lambda\); and
3. The case where \(\displaystyle W > \lambda\)

I think having three diagrams side by side might do it:

1. The case where \(\displaystyle W < \lambda\);
2. The case where \(\displaystyle W \approx \lambda\); and
3. The case where \(\displaystyle W > \lambda\)

This makes sense, but I was looking more for a visual explanation as to why this happens rather than just demonstrating it. So the real question should have been 'how can you draw the wavelength of a wave to show that when the slit is of the order of the wavelength diffraction is at a maximum?'