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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar
+//Example 3.6
+//OS = Windows 7
+//Scilab version 5.5.2
+
+clc;
+clear;
+
+//given
+
+n1=1.55;//refractive index of core
+n2=1.51//refractive index of cladding
+no=1//refractive index of air
+C=3e8//velocity of light in m/s
+deltan=n1-n2;//relative refractive index
+NA=((n1+n2)*deltan)^0.5;//Numerical aperture
+alpham=asind(NA)//acceptance angle in degrees
+deltatbyZ=(n1/n2)*deltan/C//multiple time dispersionin s/m
+mprintf("Numerical Aperture is=%.2f",NA);
+mprintf("\nAcceptance angle is=%.2f degree",alpham)
+mprintf("\nMultiple time dispersion is=%.2f ns/Km",deltatbyZ*1e12)//multiplication by 1e12 to convert unit from s/m to ns/Km
+//the answer vary slightly due to rounding