Final answer:
Diffraction from each slit in a double-slit experiment results in an interference pattern composed of both constructive and destructive interference, forming a pattern of bright and dark bands.
Step-by-step explanation:
In the context of Young's double-slit experiment, diffraction from each slit relates to the interference pattern in that both constructive interference and destructive interference occur.
Constructive interference arises when the condition d sin θ = mλ is satisfied, where d is the distance between slits, θ is the angle relative to the incident direction, m is the order of the interference, and λ is the wavelength of light. Conversely, destructive interference takes place when the condition d sin θ = (m + ½)λ is met (for m = 0, ±1, ±2, ±3, ...).
These conditions lead to the formation of a pattern of bright and dark bands on a screen, as the overlapping wavefronts from the slits either enhance each other (constructive) or cancel each other out (destructive).