Question:
The core of an optical fibre is surrounded by
The core of an optical fibre is surrounded by
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Core = High Refractive Index; Cladding = Low Refractive Index. This pair keeps the light trapped inside.
Updated On: Jul 4, 2026
- Cladding
- Plastic jacket
- Air
- Metal sheath
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Optical fibres work on the principle of Total Internal Reflection (TIR).
Step 2: Meaning
TIR occurs when light travels from a denser medium to a rarer medium at an angle exceeding the critical angle.
Step 3: Analysis
The central part (core) has a higher refractive index, and it is surrounded by a layer (cladding) with a slightly lower refractive index to enable TIR.
Step 4: Conclusion
Therefore, the cladding is the immediate layer surrounding the core. Final Answer: (A)
Optical fibres work on the principle of Total Internal Reflection (TIR).
Step 2: Meaning
TIR occurs when light travels from a denser medium to a rarer medium at an angle exceeding the critical angle.
Step 3: Analysis
The central part (core) has a higher refractive index, and it is surrounded by a layer (cladding) with a slightly lower refractive index to enable TIR.
Step 4: Conclusion
Therefore, the cladding is the immediate layer surrounding the core. Final Answer: (A)
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