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+//Example 7_18
+clc();
+clear;
+//To find the numerical aperature and acceptance angle
+n1=1.6
+n2=1.4
+n0=1.33
+NA=sqrt(n1^2-n2^2)/n0
+printf("The numerical aperature is %.3f",NA)
+theta=asin(NA)*180/%pi
+printf("\nThe acceptance angle is %.2f degrees",theta)