TS EAMCET Medical 8 May 2019 Shift 2 Paper

A 45°- 45°- 90° prism as shown in the figure is immersed in water. A ray of light is incident normally on one of its shorter faces. The minimum index of refraction that the prism must have if this ray is to be totally reflected within the glass at the long face of the glass is (Assume refractive index of water nwater = 1.3)