Why is the diffraction of mechanical waves easier to observe than the diffraction of light?

The condition for observing diffraction is the commensurability of the obstacle with the wavelength. The lengths of light waves are very small, and sound waves are of the order of a meter, so the diffraction of mechanical waves is easier to observe.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.