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+// Example 6.22.2  page 6.69
+
+clc;
+clear;
+
+n1=3.5;  //refractive index
+n=1;    //refractive index of air
+F=0.69; //transmission factor
+
+eta = 100*(n1*(n1+1)^2)^-1;     //computing eta
+
+printf("\neta external is %.1f percent i.e. small fraction of intrnally generated opticalpower is emitted from the device.",eta);
+printf("\n\n OR we can also arrive at solution,\n");
+
+r= 100*F*n^2/(4*n1^2);      //computing ratio of Popt/Pint
+
+printf("\n Popt/Pint is %.1f percent",r);
+
+printf("\nNOTE - printing mistake at final answer.\nThey have printed 40 percent it should be 1.4 percent");