Equation (8.45) was derived for the case where the light

Equation (8.45) was derived for the case where the light incident upon the sending end of the optical fiber extends over the entire acceptance cone shown in Fig. 8-12(b). Suppose the incident light is constrained to a narrower range extending between normal incidence and ?0; where ?0 <>
(a) Obtain an expression for the maximum data rate fp in terms of ?0.
(b) Evaluate fp for the fiber of Example 8-5 when ?0 = 5o.