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This lesson covers refraction of light as required by the Edexcel GCSE Physics specification (1PH0), Topic 5: Light and the Electromagnetic Spectrum. You need to understand why refraction occurs, how to draw refraction ray diagrams, and — for Higher tier — how to use Snell's law to calculate refractive index.
Refraction is the change in direction of a wave when it passes from one medium to another. It occurs because light changes speed when it enters a material with a different optical density.
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