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Name the physical principle on which the...

Name the physical principle on which the working of optical fibres is based.

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**Step-by-Step Solution:** 1. **Understanding Optical Fibres**: Optical fibres are thin strands of glass or plastic that transmit light signals over long distances. They are widely used in telecommunications and medical instruments. 2. **Identifying the Principle**: The working of optical fibres relies on a specific physical principle that governs how light behaves when it travels through different mediums. 3. **Total Internal Reflection**: The key principle at play in optical fibres is called Total Internal Reflection (TIR). This phenomenon occurs when light travels from a denser medium (like glass) to a less dense medium (like air) at an angle greater than the critical angle. ...
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