AP EAPCET 7 Sep 2021 Shift 1 Paper

Calculate the fringe width obtained from a double slit apparatus immersed in a liquid of refractive index 1.33, given it has a slit separation of 1mm, the distance between the plane of the slits and screen is 1.33m and the slits are illuminated by a parallel beam of light, whose wavelength in air is 800nm.