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+//chapter 9 example 4//
+clc
+clear
+//angular limit of the far field pattern=Am,length of the picture=l,numerical aperture=NA,distance of the fibre output end face from the screen=L//
+Am=26.1;//in degrees//
+NA=sind(Am);//numerical aperture//
+printf("\n numerical aperture=%f \n",NA)
+l=16.7;//in cm//
+L=(l/2)/(tand(Am));
+printf("\n distance from the screen=%f cm\n",L)
+\ No newline at end of file