The figure below shows a right triangular prism, with angles as shown, made of cubic zirconia immersed in water. The base of the prism is horizontal. A horizontal light ray is incident and normal to the left vertical face of the prism. It undergoes total internal reflection at point P and exits the prism at the bottom with a refraction angle of 63. The index of refraction of cubic zirconia is 2.200. (a) What is the exit angle 03 (in degrees)? |:| (b) A substance is dissolved in the water to increase the index of refraction n2. At what value of n2 does total internal reflection cease at point P? :1