White light reflected at perpendicular incidence from a soap film has, in the visible specturm, an interference amximum at 6000Å and a minimum at 4500Å with no minimum in between. If `mu=4//3` for film, what is the film thickness ?

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 incident perpendicular on a soap film gets reflected . It has an interference maximum at 5800 Å and a minimum at 4200 Å in a visible spectrum. If there is no minimum in between the two bands, find the thickness of the soap film. Take refractive index of film = 4//3 .

White light reflected from a soap film (Refractive index =1.5 ) has a maxima at 600 mm and a minima at 450 nm at with no minimum in between. Then, the thickness of the film is

Light of wavelength 6000 Å is reflected at nearly normal incidence from a soap films of refractive index 1.4 The least thickness of the fringe then will appear black is

White light is incident on a soap film at an angle of 60^@ . On examining the reflecting light by a spectroscope, a dark band corresponding to wavelength 6200Å is found. Find the minimum thickness of the film. Take refractive index of film = 1.33.

Visible light of variable wavelength is incident normally on a thin sheet of plastic in air. The reflected light has a minima only for lamba=512 nm and lambda=640 nm in the visible spectrem. What is the minimum thickness (in mum) of the film (mu=1.28) ?

Blue light of wavelength 480 nm is most strongly reflected off a thin film of oil on a glass slab when viewed near normal incidence. Assuming that the index of refraction of the oil is 1.2 and that of the glass is 1.6, what is the minimum thickness of the oil film (other then zero)?

A plane wave of monochromatic light falls normally on a uniform thin or oil which covers a glass plate. The wavelength of source can be varied continuously. Complete destructive is observed for lambda = 5000 Å and lambda = 1000 Å and for no other wavelength in between. If mu of oil is 1.3 and that of glass is 1.5, the thickness of the film will be