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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');
+\ No newline at end of file