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//chapter12,Example12_1,pg 357
n1=1.53//refractive index
n2=1.5
lam=1*10^-6//wavelength
a=50*10^-6
NA=sqrt((n1^2)-(n2^2))
V=((2*%pi*a)*NA)/lam
printf("normalised frequency\n")
printf("V=%.2f ",V)
M=(V^2)/2
printf("\ntotal no. of guided mode\n")
printf("M=%.2f",M)
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