Video: The wave equation
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Waves occur in all kinds of shapes, but they are goverend by the same physical principles described in form of differential wave equations. Here, we will derive one version which is based on elastic properties following Hook's law known from your physics lecture in semester 1. This will show us how waves propagate and identify different wave types (i.e. body waves (p, s) and surface waves (rayleigh, love)).

.. image:: VidTravelingWaves.png
  :target: https://www.youtube.com/watch?v=L8LWvgEeqxY&t=1380s
  :width: 400
  :alt: Alternative text

Waves and Rays
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- Repetition of video
- Wavefronts and Huygen's principle
- Fermat's principle and Snell's law

Lecture slides :download:`Waves and Rays <../Waves/Slides/Lecture02_Waves_rays_Snell.pdf>`

Homework
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Exercises sheet :download:`Travelling Waves and Fermat <../Waves/Exercises/TravellingWaves.pdf'