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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar
+//Example 6.10
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+E=1.15*(1.6e-19);//band gap energy in V
+h=6.62e-34;//plank's constant in S.I units
+c=3e8;//velocity of light in m/s
+
+
+lamda_c=(h*c)/(E);//critical wavelength in meter
+mprintf("The critical wavelength is=%.2f um",lamda_c*1e6);//multiplication by 1e6 to convert unit from m to um
+//the answer vary due to roundingoff