Optical Fibres

1 mark · Easy

Name the two types of glass that make up an optical fibre.

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Core (high refractive index) and cladding (low refractive index) glass

Also accept: Inner core and outer cladding; High refractive index and low refractive index glass

Common mistakes: Only one part named; Incorrect reference to plastic

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Marking points

B1 · 1 mark · Correctly names both the core and the cladding as the two parts of an optical fibre.

Worked solution

An optical fibre is made of a core (high refractive index glass) surrounded by cladding (low refractive index glass).