PHYS 1008 21022\"? Last Name (please print) Test #4 Section L2 Thurs RM. First Name [please print) Duration: 45 min Student # [please print) TA Name {please print) (3} 1. In the gure below, a light rayr initially traveling in medium 1 enters a block at angle alpha, {1, retracts at angle beta, ,3, and it so happens that its angle of approach to the next interface is at the critical angle 19,. (a) Write the angle '5' in terms of 6c. (1 mark) {b} By applying Snell's law at the Til-T32 interface, determine 3,, assum ing a = 36.0\