<image 1>A beam of light passes from medium 1 to medium 2 to medium 3 as shown in the diagram. What may be concluded about the speed of light in each medium?
['v_3 > v_1 > v_2', 'v_1 > v_2 > v_3', 'v_1 > v_3 < v_2', 'v_2 > v_3 > v_1']
More-Less dense bend away, Less-More dense bend towards. The more the bend, the bigger the difference in n 's.