Draw the path of a light ray through the two right angle prisms shown in the diagram. Note the light ray will strike the internal portion of the prism (back of the prism) at a 45 angle and the critical angle is 39\" for this plastic material. Why does this occur? What types of optical instruments use this technology? X6 Two rays of light come from point A, which is at the edge of an underwater block, and then enters your eye. Where does the block appear to be? Why does this happen? 5