Optical Fibres

2 marks · Easy

The diagram below represents a section through an optical fibre.

Optical fibre cross-section

(a)

Label A and B on the diagram as 'core' or 'cladding'.

[2 marks]

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Must show: A labelled as core, B labelled as cladding

Also accept: B as 'cladding', A as 'core'

Common mistakes: Swapping the labels

Show mark scheme and worked solution

Marking points

B1 (a) · 1 mark · Labels A as 'core'

B2 (a) · 1 mark · Labels B as 'cladding'

Worked solution

Label A as 'core' (inner circle) and B as 'cladding' (outer circle).