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When light diffracts through a double slit, what causes there to be bright and dark fringes...

When light diffracts through a double slit, what causes there to be bright and dark fringes on a viewing screen beyond the slits?

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when light diffracted thorugh two slits each slit act like a point source. At a particular time the waves coming from the slits interact each other as crest meets mrest and trough meets trough causes the maximum intensity at the central spot on the screen. When they meet by maintiaining the phase difference and path difference as ,,...... so on between the two waves causes constructive interference (bright fringes) and if they maintained path difference between them as , ..... so on causes destructive interference (dark fringes) between the waves.

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