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Question 19M.3.SL.TZ2.a

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.SL.TZ2.a
Level SL Paper 3 Time zone TZ2
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 2]
19M.3.SL.TZ2.a

Outline the differences between step-index and graded-index optic fibres.

[2]

Markscheme

refractive index of step index fibre is constant ✔

refractive index of graded index fibre decreases with distance from axis/centre ✔

graded index fibres have less dispersion ✔

step index fibre: path of rays is in a zig-zag manner ✔

graded index fibre: path of rays is in curved path ✔

For MP2 do not accept vague statements such as “index increases/varies with distance from centre”.

Examiners report

The differences between step index fibres and graded index fibres seem well-known.

Syllabus sections