In Young's double-slit experiment, the phenomenon that redistributes the wavefront and leads to the formation of fringes is interference. Interference occurs when two coherent waves, generated by the two slits, superpose and interact with each other.
The two slits act as sources of coherent waves, and these waves propagate through the double-slit arrangement. When the waves reach a screen or a detector, they interfere with each other, creating a pattern of bright and dark fringes.
The interference pattern arises due to the redistribution of the wavefronts and amplitudes. The wavefronts of the individual waves from each slit overlap and interact with each other. At certain points on the screen, the waves reinforce each other, leading to constructive interference and the formation of bright fringes. At other points, the waves can partially or completely cancel each other, resulting in destructive interference and the formation of dark fringes.
The interference pattern is a result of the redistribution of the amplitudes and phases of the waves at different points on the screen. The constructive and destructive interference occur due to the phase differences between the waves, which depend on the path lengths traveled by the waves from each slit to the point of interference.
By observing the pattern of fringes formed on the screen, one can analyze the redistribution of the wavefronts and amplitudes caused by interference, which is a fundamental aspect of Young's double-slit experiment.