Double-Split experiment with light

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Young's Double-Slit experiment demonstrates light waves interfering to create a visible interference pattern of alternating light and dark bands. The visibility of this pattern, despite the small wavelength of light, is attributed to the size of the slits, which act as point sources creating spherical wavefronts. This results in varying path lengths for the waves, leading to larger interference fringes that are detectable by the human eye. The slight changes in path length for the initial fringes allow for significant visual separation of the bands. The discussion emphasizes the relationship between slit size and the wavelength of visible light in producing observable interference patterns.
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Young's Double-Split experiment shows two waves of light interfering with each other.

However I have a question I was hoping someone can help me with.

Why is it we can see the Interference Pattern with large bands of light and dark?

Would not the waves be so small that the interference pattern would be also very small and not detectable by eye?

I can only guess its something to do with the size of the slits and the wave length of visible light.
 
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If we have narrow slits, then each slit will act like a point source for a new wave. So instead of a plane wavefront, the point source will be spherical (or cylindrical in 2D) wavefront. So the interference results in the differing path lengths that the two point sources experience when the wavefronts combine. For small angles, the change in the path length for the first few fringes is very slight and so we can get interference bands that are much larger than the actual wavelength.

Wikipedia has a good explanation in their article: http://en.wikipedia.org/wiki/Double-slit_experiment#Classical_wave-optics_formulation
 

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