Write the relation between the path difference and wavelength of light wave used for constructive and destructive interference of light

Explanation

`delta=nlambda` Where `n=0,1,2,3`………constructive interference.
`delta=(2n+1)(lambda)/(2)`, where , `n=0,1,2,3,`……
`delta=(2n-1)(lambda)/(2)`, where , `n=1,2,3,`………..destructive interference
where `lambda` is wavelength of light.