White light may be considered to be mixture of waves of `lambda` ranging between `3900 Å` and `7800 Å`. An oil film of thickness `10,000 Å` is examined normally by the reflected light. If `mu=1.4`, then the film appears bright for

White light may be considred to have lambda from 4,000 overset @A to 7,500 overset @A .If an oil film has thickness 10^(-4) cm,deduce the wavelength in the visible refion for which the reflection alog the normal direction will be strong.Take mu of the oil as 1.4.

White light may be considred to have lambda from 4000 overset @A to 7500 overset @A .If an oil film has thickness 10^(-4) cm, deduce the wavelength in the visible region for which the reflection along the normal direction will be Weak Take mu of the oil as 1.4.

A very thin transparent film of soap solution (thickness to 0) is seen under reflection of white light. Then the colour of the film appear to be :

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