In the video, light passing through two slits creates a pattern of bright and dark fringes on a screen. the bright fringes result from ; the dark fringes result from

I think the answers are constructive interference/destructive interference; . interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower or the same amplitude. The interference of two waves , when in phase, the two lower waves create constructive interference, resulting to a greater amplitude of the resultant wave. When out of phase they create a destructive interference.