Define light and how does a light ray travel?
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Light is an electromagnetic wave and the straight line paths followed by narrow beams of light, along which light energy travels, are called rays. Light always travels in straight lines although its direction can be changed by reflection or refraction. ... This displacement of light rays is called refraction.
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Rays of light usually travel in straight lines until they hit something.
This 'bending of a ray of light' when it passes from one substance into another substance is called refraction. The bending of a ray of light also occurs when the ray comes out of glass or water and passes into air.
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