A wave is incident from medium 1 (index of refraction n1 = 3.86) on an interface with a second medium of unknown refractive index n2 =?. The field reflection coefficient shown below is measured as the incident angle is varied. The magnitude of the reflection coefficient is found to go to zero for an incident angle of a = 25 and reaches 1 at b = 27.8 . 0.364 0 0.5 1 0 15 25 27.8 |r| (deg.) (a) (3 points) What is the polarization of the incident wave (TE or TM)? How do you know