air Light with a frequency of 5.5 X 101'1 Hz is travelling through glass and strikes a glass / air interface as shawn above. Angle X1 is 22.0" to the normal. Some of the light emerges from the glass and some is reected back into the glass. If the index of refraction for this glass is 1.77, What is the value of angle X3? (in deg) 18. A0 1.36 x 101 BO 1.98 x 101 DO 4.15 x 101 EC) 6.02 x 101 G0 1.27 x 102 HO 1.84 x 102 What is the value of angle x2? 19. A0 1.35 x 101 B0 1.52 x 101 DO 1.95 x 101 E0 220 x 101 G0 2.81 x 101 HO 3.17 x 101 CO 2.86 x 101 F0 3.73 x 101 (in deg) CO 1.72 x 101 F0 249 x 101