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Question 19M.3.SL.TZ1.8

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.SL.TZ1.8
Level SL Paper 3 Time zone TZ1
Command term Draw Question number 8 Adapted from N/A
8.
[Maximum mark: 2]
19M.3.SL.TZ1.8

Plane wavefronts in air are incident on the curved side of a transparent semi-circular block of refractive index 2.0.

Part of wavefront XY outside the block is shown.

Draw, on the diagram, the wavefront inside the block.

[2]

Markscheme

smooth curve of correct curvature continuous at the boundary as shown ✔

wavelength must be half the one in air; judge by eye ✔

Examiners report

Wavefronts. This straightforward application of this core topic on wave characteristics was only done well by the best candidates. Many candidates showed significant problems in demonstrating a basic understanding of manipulating wavefronts through changing mediums.