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Question 19N.3.SL.TZ0.7b(ii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.SL.TZ0.7b(ii)
Level SL Paper 3 Time zone TZ0
Command term Explain Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 2]
19N.3.SL.TZ0.7b(ii)

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.

(b(ii))

Explain chromatic aberration, with reference to your diagram in (b)(i).

[2]

Markscheme

red and blue wave fronts have different curvature/radius
OR
red and blue waves are refracted differently/have different speeds ✔

so different colors have different foci/do not focus to one point
OR
so image is multi-coloured/blurred ✔

NOTE: MP1 is for the reason for the aberration, MP2 is for the effect.

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