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+//Example 7_22
+clc();
+clear;
+//To calculate the numerical aperature
+theta=26.80 //units in degrees
+NA=sin(theta*%pi/180)
+printf("The numerical aperature is %.4f",NA)
diff --git a/3537/CH7/EX7.22/Ex7_22.txt b/3537/CH7/EX7.22/Ex7_22.txt
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+ The numerical aperature is 0.4509 \ No newline at end of file