In Fig. 33-51, light is incidentat angle θ1 = 41Ë on a boundary between two transparent materials.Some of the light travels down through the next three layers oftransparent materials, while some of it reflects upward and thenescapes into the air. If n1 = 1.3, n2 = 1.4, n3 = 1.3 and n4 = 1.5,what is the value of (a)θ4 and (b)θ5?
