3. A ray of light in air is refracted as it goes into glass undergoes total internal reflection off of air at the bottom surface of the glass; and is then refracted again as it goes back up through the glass back out into air. The top and bottom glass surfaces are parallel to each other. Which possible incident angles, 0,, will allow for this to occur? air glass air 0 (TIR) 5. The figure shows a laser beam coming from the left, deflected by a 30 -60 - 90 prism. What is the prism's index of refraction? 30 60 17