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+//Example 5.1 

+clc;

+// 1st part //critical angle

+u1=1.48;// refractive index of cladding

+u2=1.5;// refractive index of core

+u=1;// refractive index of air

+theta=asin(u1/u2);// critical angle in radian

+theta=theta*180/%pi;// to convert in degree

+disp(theta,"critical angle in degree")

+// 2nd part //fractional refractive index

+Fr=(u2-u1)/u2;// fractional refractive index

+Fr=Fr*100;// to convert in percent

+disp(Fr,"fractional refractive index in percentage")

+// 3rd part // acceptance angle

+A=asin(sqrt(u2^2-u1^2));// Acceptance angle in radian

+disp(A,"Acceptance angle in radian")

+// 4th part //numerical aperture

+NA=sin(A);// Numerical aperture

+disp(NA,"Numerical aperture ")