PH-481
Total internal reflection
Physics · Secondary 3 · Medium · Total internal reflection
In an optical fibre, the glass core has refractive index 1.50 and the cladding has refractive index 1.45. Why is this difference important for signal transmission?
- It makes the fibre stronger mechanically.
- It allows total internal reflection to keep light inside the core.
- It reduces the speed of light in the cladding to zero.
- It prevents any reflection at the boundary.
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