Can two wavefront ever cross each other?

Two wavefronts can intersect or cross each other in certain conditions, such as when they originate from different sources or have different frequencies. When they cross, they can interfere with one another, creating a pattern of constructive and destructive interference. However, the individual waves continue to propagate independently after crossing, as wavefronts represent the loci of points having the same phase. Thus, while they can cross, they do not merge into a single wavefront.