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+clc;
+clear;
+n1=1.48 //core refractive index
+delta=0.05 //fractional refractive index
+
+//calculation
+NA=n1*sqrt(2*delta) //numerical aperture
+i_a=asind(NA)
+
+mprintf("\nThe numerical aperture is = %1.3f\n",NA)
+mprintf("The acceptance angle is = %2.1f degree.",i_a)