In the figure, light is incident at angle θ1 = 37.4° on a boundarybetween two transparent materials. Some of the light then travelsdown through the next three layers of transparent materials, whilesome of it reflects upward and then escapes into the air. The indexof refractions are n1 = 1.22, n2 = 1.40, n3 = 1.32, n4 = 1.41 andnair = 1.00. What is the value of θ4?
