Describe the concepts which are pertinent to this problem. The angle of incidence at a solid or liquid boundary is 79.3°, and the index of refraction of the solid is n = 1.83. (i) What should be the index of refraction of the liquid in such a way that the direction of the light entering the liquid is not modified? (ii) Determine the biggest index of refraction that the liquid can encompass, such that none of the light is transmitted to the liquid and all of it is reflected back to the solid?