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+//chapter 9 example 5//
+clc
+clear
+//numerical aperture=NA,distance from the screen to fibre end space=D,measured output pattern size=A//
+A=6;//in cm//
+D=10;//in cm//
+NA=A/(sqrt((A^2)+4*(D^2)));
+printf("\n numerical aperture=%f m\n",NA)
+\ No newline at end of file