If ‘x’ be the path difference of the web emitting from S1 and S2 and meeting at point ‘p’ then

The point ‘p’ will be the position of maximum intensity if path difference of the wave emitting from s1 and s2 and meeting at point ‘p’ is integral multiple of wave length of light ‘l’

For minimum intensity,

Then the point ‘p’ will be the position of minimum intensity if path difference s odd integral multiple of λ/2.

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