g Draw the incident and reflected rays at the critical angle. a. Measure the angle of incidence and the angle of reflection at the critical angle. b. Use Equation 9-4 to calculate the index of refraction (to 3 sig. figs.!). c. Calculate the percent error with respect to the prism’s stated value for its index of refraction, 1.50. d. Calculate the percent difference between the angle of incidence and the angle of reflection. Ideally, what should it have been? e. Describe the intensities of beams when the critical angle is reached.