Physics - Wave Optics Question with Solution | TestHub

A thin plastic sheet of refractive index$\text{1.6}$is used to cover one of the slits, among the two slits, in a double-slit arrangement. The central point on the screen is now occupied by what would have been the$7^{th}$bright fringe before the thin plastic sheet was used. If the wavelength of light is$600 \mathrm{nm}$, the thickness (in$\mathrm{\mu m}$) of the thin plastic sheet is