Physics - Wave Optics Question with Solution | TestHub

On introducing a thin mica sheet of thickness$2\times {10}^{-6}\mathrm{ }\mathrm{m}$and refractive index$1.5$in the path of one of the waves, central bright maxima shifts by$n$fringes. The wavelength of the wave used is$5000\mathrm{ }\stackrel{\circ }{\mathrm{A}}$, then$n$is