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clc;
//page no 
//prob no. 20.3.1
//A silica fiber with 
A_max=25;A1=2;A2=0.3;
//a)Determination of repeater dist at 0.9um wavelength
z1=A_max/A1;
disp('km',z1,'a)the repeater dist for 0.9um wavelength is');
//b)Determination of repeater dist at 1.5um wavelength
z2=A_max/A2;
disp('km',z2,'a)the repeater dist for 1.5um wavelength is');