Refraction in Cologne, Germany

Refraction is the change in direction of a wave, caused by the change in the wave’s speed. Examples of waves include sound waves and light waves. Refraction is seen most often when a wave passes from one medium to a different medium. Different types of medium include air and water. When a wave passes from one medium to another medium, the wave will change its speed and its direction. For example, when a light wave travels through air and then passes through water, the wave will slow and change direction.

Source: http://simple.wikipedia.org/wiki/Refraction

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