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Published byNickolas Ferguson Modified over 9 years ago
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Science 8: Unit C – Light and Optical Systems Topic 3: Refraction
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What is Refraction? Refraction is the bending of light rays as they enter a new medium (material)
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Why Does it happen? When light rays enter a thicker medium from a thinner medium they slow down and bend TOWARDS the normal. (eg. from air to glass) When light rays enter a thinner medium from a thicker one they speed up and bend AWAY from the normal (eg. from glass back to air.
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Law of Refraction Law of Refraction: as the angle of incidence increases, the angle of refraction increases, though not necessarily by the same amount. NOTE: refraction can also occur with the same material at two different temperatures.
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How are reflection, refraction, and absorption different? The angle of incidence does not necessarily equal the angle of refraction. Reflection has to do with bouncing off a surface while refraction is bending of light rays. Absorption is the changing of light rays from light energy into another kind of energy (usually thermal energy).
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