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//Variable declaration
NA=0.20; //numerical aperture
n2=1.59; //refractive index of cladding
n0=1.33; //refractive index of water
//Calculation
n1=sqrt(NA**2+n2**2); //refractive index of core
theta0=asin(NA/n0); //acceptance angle(radian)
theta0=theta0*180/%pi; //acceptance angle(degrees)
theta0_m=60*(theta0-int(theta0));
theta0_s=60*(theta0_m-int(theta0_m));
//Result
printf('acceptance angle is %0.3f degrees %0.3f minutes %0.3f seconds \n',int(theta0),int(theta0_m),(theta0_s))
printf('answer varies due to approximating off errors\n')
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