In a Young's double slit experiment, one of the slits is covered by a thin film of thickness t=0.04 mm, and refractive index `mu=1.2+(9xx10^(-14)m^(2))/(lambda^(2))`, where `lambda` is the wavelength in meter. A beam of light consisting of two wavelength `lambda_(1)=400nm and lambda_(2)=600 nm ` falls normally on the plane of the slits. Find the distance between two central maxima in milimeter. Distance of screen from slits is 400 times the the separation between the slits.

Answer

5