TS EAMCET 14-Sep-2020 Shift 2 Solved Paper

Consider a glass prism immersed in a liquid as shown below. The refractive index of glass and liquid is 1.5 and 1.2 respectively. A ray of light enters the prism perpendicular to the face AB. The largest value of angle 0 is, if the ray is totally reflected at the face AC: