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Waves

Water Waves - Reflection.

Water waves are reflected from hard flat surfaces as shown below.

 

Reflection of Water Waves

Note that the total length of the line representing the wave peak
stays the same where it is being reflected.
The red part of the incident wave plus the blue part of the reflected wave
is the same as the original line.

After reflection, a wave has the same speed, frequency and wavelength,
it is only the direction of the wave that has changed.

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