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+//Chapter 1 Example2//
+//refractive index of air=na,acceptance angle=a,numerical aperture=NA//
+clc;
+clear;
+NA=0.3;
+a=asind(NA);
+printf("\n a) acceptance angle=%f\n",a);
+//direction of screw rays=s,acceptance angle of screw rays=as//
+s=45;
+as=(asind(NA))/(cosd(s));
+printf("\n b) acceptance angle of screw rays=%f\n",as);