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//Chapter-3,Example 3_17,Page 3-25
clc()
//Given Data:
n1=1.48 //R.I. of core
delta=0.055 //Realtive R.I.
lam=1*10^-6 //Wavelength of light
a=50*10^-6 //core radius
//Calculations:
//Delta=(u1-u2)/u1
n2=n1-(n1*delta) //R.I. of cladding
NA=n1*sqrt(2*delta) //Formula to find Numerical Aperture
printf('Numerical Aperture of Fibre is =%.4f \n \n',NA)
theta0=asin(NA)*180/%pi //Acceptance angle of fibre
printf(' Acceptance angle of Fibre is =%.2f degrees \n \n',theta0)
V=2*%pi*a*NA/lam //V number
N=(V^2)/2 //Number of guided modes
//In book,instead of NA , value of delta is taken into calculation.
//Thus there is calculation mistake in values of V and N.
printf(' V number of Fibre is =%.3f \n \n',V)
printf(' Number of guided mode of Fibre is =%.3f \n',N)
printf('(Calculation mistake in book)')
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