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It's not, it's just for diffraction to be at its greatest, the gap should be similar to the wavelength of the wave. Therefore it is much easier to see (or more rather hear!) the diffraction of sound waves than light. Light has very small wavelengths ( speed of light = frequency * wavelength ) the wavelengths are normally in the region of 400 - 700 nanometers (x10-9 m) so for diffraction to occur the light would have to be diffracted through a very tiny gap - for example atomic spacing. I'm not sure how to explain this simply, i hope this makes sense.
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