Suppose the fiber depicted in Figure 26-75 has an index of refraction of 1.62 and its curved surface is surrounded by a cladding material with an index of refraction of 1.52.

In figure 26-75

(a) What is the critical angle for total internal reflection of rays at the fiber cladding boundary?
(b) What is the maximum angle θi at which rays can enter the fiber from air as shown and undergo total internal reflection?
(c) If the diameter of the fiber core is 9.0 μm, how many reflections per meter does the ray undergo when it arrives at the boundary at the critical angle?