1.

The index profile of a core of multimode graded index fiber is given by-

A. N (r) = n1 [1 – 2Δ(r<sup>2</sup>/a)<sup>2</sup>]<sup>1/2</sup>; r<a
B. N (r) = n1 [3 – 2Δ(r<sup>2</sup>/a)<sup>2</sup>]<sup>1/2</sup>; r<a
C. N (r) = n1 [5 – 2Δ(r<sup>2</sup>/a)<sup>2</sup>]<sup>1/2</sup>; r>a
D. N (r) = n1 [1 – 2Δ(r<sup>2</sup>/a)<sup>2</sup>]<sup>1/2</sup>; r<a
Answer» E.


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