Question

diffraction of sound waves is common in nature,but not in light waves why?

Answer 1

Because the wavelength of sound waves is much longer than the wavelength of light.  The wavelength of green light is about half a micron -- half a millionth of a meter, or half a thousandth of a millimeter.  The wavelength of A above middle C is about 78 cm.  That's a difference of a factor of about a million and a half.

Another factor is coherence.  It's easy to get  coherent sound -- again, a factor of the much longer wavelength.  The only easy way to get coherent light is with a laser.


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