write the definition of reflection
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- Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.
- Common examples include the reflection of light, sound and water waves.
- In acoustics, reflection causes echoes and is used in sonar. In geology, it is important in the study of seismic waves.
- Reflection is observed with surface waves in bodies of water.
- Reflection is observed with many types of electromagnetic wave, besides visible light.
- Reflection of VHF and higher frequencies is important for radio transmission and for radar.
- Even hard X-rays and gamma rays can be reflected at shallow angles with special "grazing" mirrors.
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