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Question 18M.3.SL.TZ2.8b

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ2.8b
Level SL Paper 3 Time zone TZ2
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 2]
18M.3.SL.TZ2.8b

A ray diagram for a converging lens is shown. The object is labelled O and the image is labelled I.

(b)

The diagram shows an incomplete ray diagram which consists of a red ray of light and a blue ray of light which are incident on a converging glass lens. In this glass lens the refractive index for blue light is greater than the refractive index for red light.

Using the diagram, outline the phenomenon of chromatic aberration.

[2]

Markscheme

completes diagram with blue focal point closer to lens

 

blue light/rays refracted/deviated more

OR

speed of blue light is less than speed of red light

OR

different colors/wavelengths have different focal points/converge at different points

 

First marking point can be explained in words or seen on diagram

[2 marks]

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