How does refractive index vary in graded index fibre?
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In the graded fibre, refractive index of a material vary due to effect in their speed
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fiber optics, a graded index is an optical fiber whose core has a refractive index that decreases with increasing radial distance from the optical axis of the fiber. ... The most common refractive index profile for a graded-index fiber is very nearly parabolic.
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