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Question 20N.3.SL.TZ0.a

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.SL.TZ0.a
Level SL Paper 3 Time zone TZ0
Command term Draw Question number a Adapted from N/A
a.
[Maximum mark: 2]
20N.3.SL.TZ0.a

A beam of monochromatic light from infinity is incident on a converging lens A. The diagram shows three wavefronts of the light and the focal point f of the lens.

Draw on the diagram the three wavefronts after they have passed through the lens.

[2]

Markscheme

wavefront separation identical and equal to separation before the lens ✓

wavefronts converging, approximately centered on f ✓

 

By eye.

Dotted construction lines are not required, allow wavefronts to extend beyond or be inside the dotted lines here.

Allow [1 max] if only two wavefronts drawn. 

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