At a point on the screen in YDSE, 3rd maxima is observed at t = 0. Now screen is slowly moved with constant speed away from the slits in such a way that the centre of slits and centre of screen lie on same line always and at t = 1s, the intensity at that point is observed to be of maximum intensity in between 2nd and 3rd maxima. The speed of screen will be (D = 1m)
