A thin oil film of refractive index 1.2 floats on the surface of water `(mu = 4/3)`. When a light of wavelength `lambda = 9.6xx 10^(-7)m` falls normally on the film from air, then it appears dark when seen normally. The minimum change in its thickness for which it will appear bright in normally reflected light by the same light is:

A thin oil film of refracting index 1.2 floats on the surface of water (mu=4/3) . When a light of wavelength lamda=9.6xx10^(-7)m falls normally on the film air, then it appears dark when seen normally. The minimum change in its thickness for which it will appear bright in normally reflected light by the same light is Zxx10^(-7)m . Then find Z .

A thin oil film of refracting index 1.2 floats on the surface of water (mu=4/3) . When a light of wavelength lamda=9.6xx10^(-7)m falls normally on the film air, then it appears dark when seen normally. The minimum change in its thickness for which it will appear bright in normally reflected light by the same light is Zxx10^(-7)m . Then find Z .

A light of wavelength 5890Å falls normally on a thin air film. The minimum thickness of the film such that the film appears dark in reflected light is

A light of wavelength 5890Å falls normally on a thin air film. The minimum thickness of the film such that the film appears dark in reflected light is

The minimum thickness of air film which appears dark under green light of wavelength 500 nm is:

A parallel beam of light of wavelength 560 nm falls on a thin film of oil (refractive index = 1.4). What should be the minimum thickness of the film so that it strongly S4 T z reflects the light ?

White light is incident normally on a thin glass plate of refractive index 1.5. Calculate the minimum thickness of the film for which the wavelength 4200 Å is absent for the reflected light.