JEE Main 9 Jan 2019 Shift 1 Solved Paper

Consider a tank made of glass(reiractive index 1.5) with a thick bottom. It is filled with a liquid of refractive index µ,. A student finds that, irrespective of what the incident angle i (see figure) is for a beam of light entering the liquid, the lightreflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of µ is :