Q.

Multimode step index fiber has

A. large core diameter & large numerical aperture
B. large core diameter and small numerical aperture
C. small core diameter and large numerical aperture
D. small core diameter & small numerical aperture
Answer» A. large core diameter & large numerical aperture
Explanation: multimode step-index fiber has large core diameter and large numerical aperture. these parameters provides efficient coupling to inherent light sources such as led’s.
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