Diffraction is primarily related to light as a wave motion phenomenon. Diffraction occurs when light waves encounter an obstacle or aperture and bend around it, causing interference patterns to form. This behavior is characteristic of wave motion, as particles do not exhibit wave-like properties such as interference and diffraction. However, light can also exhibit particle-like behavior in certain experiments, such as the photoelectric effect, where light behaves as a stream of particles called photons. So, while diffraction is primarily a wave phenomenon, light can also exhibit particle-like behavior in some cases.
