AS Physics - Diffraction

Diffraction 

Super Position 

When two waves overlap, the final displacement is equal to the sum of their individual displacements. When superposition occurs it results in specific patterns and this is called Interference, some examples of patterns produced are standing waves. Superposition is a concept used to explain diffraction. 

Diffraction 

Huygen's principle explains why diffraction occurs, it states that every point on a wave acts as a source of spherical waves. So each wavelet on a wave creates its own spherical wave which forms a new wavefront. 

Single-slit diffraction interference

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