A parallel beam of white light is incident normally on a water film 1.0 × 10-4 cm thick. Find the wavelength in the visible range 1400 nm-700 nm) which are strongly transmitted by the film. Refractive index of water = 133.
Given, refractive index,
And thickness of the film be the
Here, the light is strongly transmitted.
therefore,
now, for n=4
now, for n=5
now, for n=6