$\begin{array}{1 1} \text{For diffraction in light the size of the obstacles should be very small when component to wave length of light which is not common } \\ \text {wave length of sound waves is of the order of 15 m to 15 m , which is available } \\ \text{For diffraction in light the size of the obstacles should be very large, when compared to its wave length } \\ \text{wave length of sound waves is very small, So diffraction of these waves is more evident } \end{array} $
