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+//Caption:Calculate (i)-cutoff wavelength,(ii)-cutoff frequency,(iii)-wavelength in guide
+//Exa:4.12
+clc;
+clear;
+close;
+c=3*10^10;//in cm/s
+d=4;//in cm
+r=d/2;//in cm
+wl_c=2*%pi*r/1.841;//in cm
+f_c=c/wl_c;
+f_signal=5*10^9;//in Hz
+wl_o=c/f_signal;
+wl_g=wl_o/sqrt(1-(wl_o/wl_c)^2);
+disp(wl_c,'Cut-off wavelength (in cm) =');
+disp(f_c,'Cut-off frequency (in Hz) =');
+disp(wl_g,'Guide wavelength (in cm) =');