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Question 19N.3.SL.TZ0.b(iii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.SL.TZ0.b(iii)
Level SL Paper 3 Time zone TZ0
Command term Describe Question number b(iii) Adapted from N/A
b(iii).
[Maximum mark: 2]
19N.3.SL.TZ0.b(iii)

A planar wavefront of white light, labelled A, is incident on a converging lens. Point P is on the surface of the lens and the principal axis. The blue component of the transmitted wavefront, labelled B, is passing through point P.

An achromatic doublet reduces the effect of chromatic aberration. Describe an achromatic doublet.

[2]

Markscheme

mention combination of converging and diverging lenses ✔
of different refractive index/material ✔

NOTE: Achromatic doublet is in the question, so no marks for mentioning this.

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