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The Diffraction of Water Waves in a Harbour.

The wavelength of water waves may be several metres.
If the wavelength is of a similar size to a gap in a harbour wall,
then the wave will diffract as shown in the picture below.

Diffraction of Water Waves

If the wavelength does not match the size of the gap,
then only a little diffraction will occur at the edge of the wave.
See the picture below.

No Diffraction of Water Waves

The part of the wave which hits the wall in the
above two pictures is reflected straight back on itself.

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