A clear plastic paperweight with an unknown index of refraction rests on your desk as shown in the figure. A ray of light enters the top of the paper weight with a 65.0 angle of incidence a undergoes total internal reflection (TIR) at the right side of the paperweight. 8 plastic air (a) Determine the minimum value for the index of refraction of the plastic for which TIR will occur. NOTE: sin(90) = cos(p) and cos(0) = 1 - sin (9) 40