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Question 17N.3.HL.TZ0.15b

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Date November 2017 Marks available [Maximum mark: 3] Reference code 17N.3.HL.TZ0.15b
Level HL Paper 3 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 3]
17N.3.HL.TZ0.15b

Some optic fibres consist of a core surrounded by cladding as shown in the diagram.

(b)

Outline how the combination of core and cladding reduces the overall dispersion in the optic fibres.

[3]

Markscheme

because the critical angle is nearly 90°

then only rays that are «almost» parallel to the fibre pass down it

so pulse broadening is reduced

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