A) the refractive index of the optical fibre increases as the radial distance from the fibre axis increases.
B) the refractive index of the optical fibre decreases as the radial distance from the fibre axis increases.
C) the refractive index of the optical fibre remains same throughout.
D) inner side of cladding is mirrored to ensure reflection.
Correct Answer: B
Solution :
Option [b] is correct. Explanation: In graded index fibres, the refractive index of the optical fibre decreases as the radial distance from the fibre axis increases.
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