Like all waves, light waves change direction by reflection, refraction, and diffraction.%C2%A0 %C2%A0is the bending of waves due to a change in speed.%C2%A0 %C2%A0occurs when all or part of a wave is unable to pass through something and bounces back. When waves move around barriers or through openings in a barrier, it is called .
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When waves move around barriers or through openings in a barrier, it is called diffraction.