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+clc;clear;
+//Example 24.2
+//calculation of acceptance angle
+
+//given values
+n=1.59;//cladding refractive index
+u=1.33;//refractive index of water
+N=.20;//numerical aperture offibre
+//calculation
+x=sqrt(N^2+n^2);//index of fibre
+N1=sqrt(x^2-n^2)/u;//numerical aperture when fibre is in water
+alpha=asin(N1)*180/%pi;
+disp(alpha,'acceptance angle in degree is');
+\ No newline at end of file