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//Chapter-3,Example3_4_4,pg 3-12
wavelength=1*10^-6 //wavelength of light
d=6*10^-6 //diameter of core
n1=1.45 //refractive index of core
n2=1.448 //refractive index of cladding
angle_c=asind(n2/n1) //critical angle is 'sin(angle_c) = n2/n1'
printf("\nThe critical angle is angle_c = %.f Degree\n",angle_c)
NA=sqrt(n1^2-n2^2)
angle_0=asind(NA) //acceptance angle is 'sin(angle_0) = NA = sqrt(n1^2-n2^2)'
printf("\nThe acceptance angle is angle_0 = %.3f Degree\n",angle_0)
N=%pi^2*d^2*NA^2/(2*wavelength^2) //the number of modes propogating through fibre
printf("\nthe number of modes propogating through fibre is N = %.f\n",N)
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