Question

Find the displacement of interference fringes due to the introduction of a
thin film in between one of the interfering beams. ​

Answer 1

the source is increased because, fringe width and frequency have inversely dependent on each other.d is the distance between the slits. ) has a direct dependence on D, fringe width decreases if the distance between the slits and screen is decreased. ) of the source is increased because, fringe width and frequency have inversely dependent on each other.