In YDSE fringes are obtained using light of wavelength `4800 A^(@)`. One slit is covered with a thin glass film on refractive index 1.4 and another slit is covered by a film of same thickness but refractive index 1.7. By doing so the central fringe is shifted to fifth bright fringe in the original pattern. The thickness of glass film is `x xx 10^(-3)mm`, what is the value of x ?

Answer

8