O-LevelPhysicsLight5054/11 · Oct/Nov 2013 · Q201 Mark

Which diagram represents the reflection of light along an optical fibre?

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Adiagram showing light rays entering a fibre and reflecting off the inner surfaces, but not undergoing total internal reflection.

Bdiagram showing light rays entering a fibre and undergoing total internal reflection at the inner surfaces, staying within the fibre.

Cdiagram showing light rays entering a fibre and refracting through the material, with some reflections.

Ddiagram showing light rays entering a fibre and passing straight through without any reflections.

✓ Correct answer

B: diagram showing light rays entering a fibre and undergoing total internal reflection at the inner surfaces, staying within the fibre.

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