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+//clear//
+//Caption: Finding mean frequency spacing
+//Example10.2
+//page 343
+clear;
+clc;
+close;
+C = 3e08; //free space velocity
+delta_Lambda = 0.8e-09; //spectral band in meter
+Lambda = 1550e-09;//wavelength in meter
+delta_v = C*delta_Lambda/Lambda^2;
+disp(ceil(delta_v*1e-09),'Mean Frequency spacing in GHz =')
+//Result
+// Mean Frequency spacing in GHz = 100.