Wave Behaviour Summary

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There are two laws of reflection.
1. The angle of incident is equal to the angle of reflection.
2. The incident ray or wave, the reflected ray or wave,
and the normal all lie in the same plane.

Echos can be used to calculate the depth of the sea,
and to locate fish. Using Distance Travelled = Speed x Time Taken

When waves change speed they also change direction,
this is called refraction.

If the size of an object is similar to the wavelength of a wave
it bends round it and spreads out as it passes. This is diffraction.