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+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar
+//Example 5.7
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+lamda=0.85*1e-6;//wavelength of GaAs in m
+n1=3.6;//refractive index
+K=1700//number of modes
+L=K*lamda/(2*n1);//length of the cavity in m
+mprintf("\n Length of cavity in the laser=%.0f um",L*1e6);//the answer vary due to rounding//multiplication by 1e6 to convert the unit to um
+u=2*n1*L;//partial product
+v=(lamda)^2;//partial product
+dellamda=v/u;//separation wavelength between the two mode in m
+mprintf("\nThe separation wavelength between the two mode=%.2f nm",dellamda*1e9);//multiplication by 1e9 to convert the unit to nm// the answer given in textbook is wrong the unit is nm but the textbook gives it as um
+