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+//Chapter 1 Example3//
+clc;
+clear;
+//refractive index of W step index fibre=n1,refractive index difference between core and cladding=d,numerical aperture=NA//
+d=0.02;
+n1=1.46;
+n2=n1-(n1*d);
+v=n1+n2;
+b=n1-n2;
+NA=sqrt(v*b);
+printf("\n a) numerical aperture=%f,n\",NA);
+//solid acceptance angle in air=as,critical angle of core cladding interface=p//
+as=%pi*(NA^2);
+printf("\n b) solid acceptance angle in air=%f,n\",as);
+p=asind(n2/n1);
+printf("\n c) critical angle of core cladding interface=%f,n\",p);
+\ No newline at end of file