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Refraction
Refraction is the change in direction of a wave due to a change in its transmission medium.
Refraction is the change indirection of a beam of light when it goes through a different medium, such as water.
Glasses (spectacles) make use of refraction to correct the vision of people who are nearsighted or farsighted.
Telescopes use it to present images of distant objects.
Prisms refract light into discrete colors. This information can be used to determine the chemical content of a distant star or something being burned here on earth.
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