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Science 8: Unit C – Light and Optical Systems

Science 8: Unit C – Light and Optical Systems. Topic 3: Refraction. What is Refraction?. Refraction is the bending of light rays as they enter a new medium (material). Why Does it happen?.

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Science 8: Unit C – Light and Optical Systems

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  1. Science 8: Unit C – Light and Optical Systems Topic 3: Refraction

  2. What is Refraction? • Refraction is the bending of light rays as they enter a new medium (material)

  3. 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.

  4. 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.

  5. 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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