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