A graded-index fiber has a core with parabolic refractive index profile of diameter of 30‚âà√≠¬¨‚à´m, NA=0.2, ‚âà√≠¬¨‚Ñ¢=1‚âà√≠¬¨‚à´m. Estimate the normalised frequency.$

A graded-index fiber has a core with parabolic refractive index profil

1.	A graded-index fiber has a core with parabolic refractive index profile of diameter of 30‚âà√≠¬¨‚à´m, NA=0.2, ‚âà√≠¬¨‚Ñ¢=1‚âà√≠¬¨‚à´m. Estimate the normalised frequency.$
A.	19.32
B.	18.84
C.	16.28
D.	17.12
Answer» C. 16.28