In the figure, light is incidentat angle θ1 = 22.6° on a boundary between two transparentmaterials. Some of the light then travels down through the nextthree layers of transparent materials, while some of it reflectsupward and then escapes into the air. The index of refractions aren1 = 1.28, n2 = 1.40, n3 = 1.32, n4 = 1.49 and nair = 1.00. a) What is the value of θ4?
