Question

plz tell me How the path difference in young' double split experiment is = ? (as in the picture)

Answer 1

let one eq be y = sin kx
another eq of interfere wave = y = sin( k(x+ delta x)

So, phase difference = K × delta x
As k = 2 × pie/ lambda

SO phase difference = 2 pie / lambda × pathdifference

so path difference = lambda/ 2 pie phase difference