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+// chapter 3 , Example 3.2 , pg 85
+n1=1.5//core refractive index
+n2=1.47//cladding refractive index
+c=3*10^8//speed of light(in m/s)
+P=(n1*(n1-n2))/(n2*c)  //pulse broadening per unit length due to multiple dispersion
+//P=(del_t/L)    where del_t=time interval  , L=distance  transversed by ray inside core
+printf("pulse broadening per unit length due to multiple dispersion(in s/m)")
+disp(P)