In step-index optical fibers, which of the... | Agricultural Physics

ICAR JRF Agricultural Physics 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

In step-index optical fibers, which of the following is correct

Cladding material has higher refractive index than core Cladding material has lower refractive index than core Correct Core and cladding are made of material of same refractive index Refrective index of core and cladding material is not considered

Total Internal Reflection in Optical Fibers:
In a step-index optical fiber, light propagates along the central core via continuous total internal reflection at the core-cladding boundary.
By Snell's law, total internal reflection requires light to travel from a medium of higher refractive index into a medium of lower refractive index.
Therefore, the cladding material must possess a lower refractive index than the core ($n_{\text{cladding}} \lt n_{\text{core}}$). (Correct answer: Option 2)

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