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+//Fiber Optics Communication Technology, by Djafer K. Mynbaev and Lovell L.scheiner
+//Windows 8
+//Scilab version- 6.0.0
+//Example 12.2.1
+clc;
+clear ;
+//given
+
+deltaf=100E9;//spacing in Hz
+lambda=1550;//wavelength in nm
+c=3E17;//speed of light in nm/s
+f=c/lambda;
+
+x=1/(f*f);
+deltalambda=c*deltaf*x;//Spacing between channels in nm
+
+mprintf("Spacing between channels is = %.2f nm",deltalambda);