Level 2
Level 2 requires school mathematics. Suitable for pupils.
Illustration Propagation of a plane light wave according to the Huygens principle
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A plane wave (for example from a laser), whose propagation can be explained with the Huygens principle. At each point of the plane light wave, a spherical wave is created, which continues to propagate forward. The overlapping of all spherical waves results in a new plane wave, which has spread a bit.