In order to see diffraction the thickness of the film is

The size of obstacle in order to observe diffraction of light must be

White light reflected at normal incidence from a soap film has minima at 6500Å and maxima at 7500Å in the visible region without minimum in between. If mu is (5)/(3) for the thin film, thickness of the film is

White light reflected at normal incidence from a soap film has minima at 6500Å and maxima at 7500Å in the visible region without minimum in between. If mu is (5)/(3) for the thin film, thickness of the film is