Physics - Wave Optics Question with Solution | TestHub

In a double slit experiment, when a thin film of thickness$\mathrm{t}$having refractive index$\mathrm{\mu }$is introuduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of$\mathrm{t}$is$(\mathrm{\lambda }$is the wavelength of the light used):