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+//Exa 8.3
+clc;
+clear;
+close;
+//Given data :
+lambda=1300;//in nm
+lambda=lambda*10^-9;//in meter
+ETA=90;//quantum efficiency in % 
+h=6.63*10^-34;//Planks constant
+q=1.6*10^-19;//in coulamb
+c=3*10^8;//in m/s
+R=(ETA/100)*q*lambda/(h*c);//in A/W
+disp(R,"Responsivity of InGaAs in A/W : ");
+\ No newline at end of file