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+//Example 7_3
+clc();
+clear;
+//To calculate the numerical apperture and angle of acceptance
+n1=1.48
+delta=0.05
+NA=n1*sqrt(2*delta)
+printf("Numerical apperture is NA=%.3f\n",NA)
+ia=asin(NA)*180/%pi //units in degrees
+printf("Angle of acceptance is ia=%.2f Degrees",ia)